336 lines
12 KiB
C#
336 lines
12 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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namespace Swan
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{
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/// <summary>
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/// Provides various extension methods for Reflection and Types.
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/// </summary>
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public static class ReflectionExtensions
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{
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/// <summary>
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/// Gets all types within an assembly in a safe manner.
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/// </summary>
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/// <param name="assembly">The assembly.</param>
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/// <returns>
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/// Array of Type objects representing the types specified by an assembly.
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/// </returns>
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/// <exception cref="ArgumentNullException">assembly.</exception>
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public static IEnumerable<Type> GetAllTypes(this Assembly assembly)
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{
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if (assembly == null)
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throw new ArgumentNullException(nameof(assembly));
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try
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{
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return assembly.GetTypes();
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}
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catch (ReflectionTypeLoadException e)
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{
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return e.Types.Where(t => t != null);
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}
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}
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#region Type Extensions
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/// <summary>
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/// The closest programmatic equivalent of default(T).
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>
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/// Default value of this type.
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/// </returns>
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/// <exception cref="ArgumentNullException">type.</exception>
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public static object? GetDefault(this Type type)
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{
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if (type == null)
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throw new ArgumentNullException(nameof(type));
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return type.IsValueType ? Activator.CreateInstance(type) : default;
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}
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/// <summary>
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/// Determines whether this type is compatible with ICollection.
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/// </summary>
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/// <param name="sourceType">The type.</param>
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/// <returns>
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/// <c>true</c> if the specified source type is collection; otherwise, <c>false</c>.
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/// </returns>
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/// <exception cref="ArgumentNullException">sourceType.</exception>
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public static bool IsCollection(this Type sourceType)
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{
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if (sourceType == null)
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throw new ArgumentNullException(nameof(sourceType));
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return sourceType != typeof(string) &&
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typeof(IEnumerable).IsAssignableFrom(sourceType);
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}
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/// <summary>
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/// Gets a method from a type given the method name, binding flags, generic types and parameter types.
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/// </summary>
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/// <param name="type">Type of the source.</param>
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/// <param name="bindingFlags">The binding flags.</param>
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/// <param name="methodName">Name of the method.</param>
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/// <param name="genericTypes">The generic types.</param>
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/// <param name="parameterTypes">The parameter types.</param>
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/// <returns>
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/// An object that represents the method with the specified name.
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/// </returns>
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/// <exception cref="System.Reflection.AmbiguousMatchException">
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/// The exception that is thrown when binding to a member results in more than one member matching the
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/// binding criteria. This class cannot be inherited.
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/// </exception>
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public static MethodInfo GetMethod(
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this Type type,
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BindingFlags bindingFlags,
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string methodName,
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Type[] genericTypes,
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Type[] parameterTypes)
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{
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if (type == null)
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throw new ArgumentNullException(nameof(type));
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if (methodName == null)
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throw new ArgumentNullException(nameof(methodName));
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if (genericTypes == null)
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throw new ArgumentNullException(nameof(genericTypes));
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if (parameterTypes == null)
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throw new ArgumentNullException(nameof(parameterTypes));
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var methods = type
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.GetMethods(bindingFlags)
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.Where(mi => string.Equals(methodName, mi.Name, StringComparison.Ordinal))
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.Where(mi => mi.ContainsGenericParameters)
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.Where(mi => mi.GetGenericArguments().Length == genericTypes.Length)
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.Where(mi => mi.GetParameters().Length == parameterTypes.Length)
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.Select(mi => mi.MakeGenericMethod(genericTypes))
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.Where(mi => mi.GetParameters().Select(pi => pi.ParameterType).SequenceEqual(parameterTypes))
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.ToList();
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return methods.Count > 1 ? throw new AmbiguousMatchException() : methods.FirstOrDefault();
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}
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/// <summary>
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/// Determines whether [is i enumerable request].
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>
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/// <c>true</c> if [is i enumerable request] [the specified type]; otherwise, <c>false</c>.
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/// </returns>
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/// <exception cref="ArgumentNullException">type.</exception>
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public static bool IsIEnumerable(this Type type)
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=> type == null
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? throw new ArgumentNullException(nameof(type))
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: type.IsGenericType && type.GetGenericTypeDefinition() == typeof(IEnumerable<>);
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#endregion
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/// <summary>
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/// Tries to parse using the basic types.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <param name="value">The value.</param>
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/// <param name="result">The result.</param>
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/// <returns>
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/// <c>true</c> if parsing was successful; otherwise, <c>false</c>.
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/// </returns>
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/// <exception cref="ArgumentNullException">type</exception>
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public static bool TryParseBasicType(this Type type, object value, out object? result)
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{
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if (type == null)
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throw new ArgumentNullException(nameof(type));
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if (type != typeof(bool))
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return TryParseBasicType(type, value.ToStringInvariant(), out result);
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result = value.ToBoolean();
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return true;
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}
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/// <summary>
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/// Tries to parse using the basic types.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <param name="value">The value.</param>
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/// <param name="result">The result.</param>
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/// <returns>
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/// <c>true</c> if parsing was successful; otherwise, <c>false</c>.
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/// </returns>
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/// <exception cref="ArgumentNullException">type</exception>
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public static bool TryParseBasicType(this Type type, string value, out object? result)
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{
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if (type == null)
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throw new ArgumentNullException(nameof(type));
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result = null;
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return Definitions.BasicTypesInfo.Value.ContainsKey(type) && Definitions.BasicTypesInfo.Value[type].TryParse(value, out result);
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}
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/// <summary>
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/// Tries the type of the set basic value to a property.
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/// </summary>
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/// <param name="propertyInfo">The property information.</param>
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/// <param name="value">The value.</param>
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/// <param name="target">The object.</param>
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/// <returns>
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/// <c>true</c> if parsing was successful; otherwise, <c>false</c>.
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/// </returns>
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/// <exception cref="ArgumentNullException">propertyInfo.</exception>
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public static bool TrySetBasicType(this PropertyInfo propertyInfo, object value, object target)
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{
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if (propertyInfo == null)
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throw new ArgumentNullException(nameof(propertyInfo));
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try
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{
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if (propertyInfo.PropertyType.TryParseBasicType(value, out var propertyValue))
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{
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propertyInfo.SetValue(target, propertyValue);
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return true;
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}
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}
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#pragma warning disable CA1031 // Do not catch general exception types
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catch
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#pragma warning restore CA1031 // Do not catch general exception types
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{
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// swallow
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}
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return false;
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}
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/// <summary>
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/// Tries the type of the set to an array a basic type.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <param name="value">The value.</param>
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/// <param name="target">The array.</param>
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/// <param name="index">The index.</param>
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/// <returns>
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/// <c>true</c> if parsing was successful; otherwise, <c>false</c>.
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/// </returns>
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/// <exception cref="ArgumentNullException">type</exception>
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public static bool TrySetArrayBasicType(this Type type, object value, Array target, int index)
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{
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if (type == null)
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throw new ArgumentNullException(nameof(type));
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if (target == null)
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return false;
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try
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{
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if (value == null)
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{
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target.SetValue(null, index);
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return true;
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}
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if (type.TryParseBasicType(value, out var propertyValue))
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{
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target.SetValue(propertyValue, index);
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return true;
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}
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if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
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{
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target.SetValue(null, index);
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return true;
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}
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}
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#pragma warning disable CA1031 // Do not catch general exception types
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catch
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#pragma warning restore CA1031 // Do not catch general exception types
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{
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// swallow
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}
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return false;
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}
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/// <summary>
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/// Tries to set a property array with another array.
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/// </summary>
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/// <param name="propertyInfo">The property.</param>
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/// <param name="value">The value.</param>
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/// <param name="obj">The object.</param>
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/// <returns>
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/// <c>true</c> if parsing was successful; otherwise, <c>false</c>.
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/// </returns>
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/// <exception cref="ArgumentNullException">propertyInfo.</exception>
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public static bool TrySetArray(this PropertyInfo propertyInfo, IEnumerable<object>? value, object obj)
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{
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if (propertyInfo == null)
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throw new ArgumentNullException(nameof(propertyInfo));
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var elementType = propertyInfo.PropertyType.GetElementType();
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if (elementType == null || value == null)
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return false;
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var targetArray = Array.CreateInstance(elementType, value.Count());
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var i = 0;
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foreach (var sourceElement in value)
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{
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var result = elementType.TrySetArrayBasicType(sourceElement, targetArray, i++);
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if (!result) return false;
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}
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propertyInfo.SetValue(obj, targetArray);
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return true;
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}
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/// <summary>
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/// Convert a string to a boolean.
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/// </summary>
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/// <param name="str">The string.</param>
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/// <returns>
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/// <c>true</c> if the string represents a valid truly value, otherwise <c>false</c>.
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/// </returns>
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public static bool ToBoolean(this string str)
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{
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try
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{
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return Convert.ToBoolean(str);
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}
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catch (FormatException)
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{
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// ignored
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}
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try
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{
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return Convert.ToBoolean(Convert.ToInt32(str));
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}
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#pragma warning disable CA1031 // Do not catch general exception types
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catch
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#pragma warning restore CA1031 // Do not catch general exception types
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{
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// ignored
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}
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return false;
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}
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/// <summary>
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/// Convert a object to a boolean.
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/// </summary>
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/// <param name="value">The value.</param>
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/// <returns>
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/// <c>true</c> if the string represents a valid truly value, otherwise <c>false</c>.
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/// </returns>
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public static bool ToBoolean(this object value) => value.ToStringInvariant().ToBoolean();
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}
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}
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