58 lines
2.3 KiB
C#
58 lines
2.3 KiB
C#
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using QFSW.QC.Utilities;
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using System;
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using System.Globalization;
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using System.Reflection;
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namespace QFSW.QC.Internal
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{
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internal class FieldDelegateMethod : FieldMethod
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{
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public FieldDelegateMethod(FieldInfo fieldInfo) : base(fieldInfo)
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{
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if (!_fieldInfo.IsStrongDelegate())
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{
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throw new ArgumentException("Invalid delegate type.", nameof(fieldInfo));
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}
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if (_fieldInfo.IsStatic)
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{
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_internalDelegate = (Func<FieldInfo, object[], object>)StaticInvoker;
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}
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else
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{
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_internalDelegate = (Func<object, FieldInfo, object[], object>)NonStaticInvoker;
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}
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_parameters = _fieldInfo.FieldType.GetMethod("Invoke").GetParameters();
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for (int i = 0; i < _parameters.Length; i++)
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{
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_parameters[i] = new CustomParameter(_parameters[i], $"arg{i}");
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}
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}
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public override object Invoke(object obj, BindingFlags invokeAttr, Binder binder, object[] parameters, CultureInfo culture)
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{
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object[] realParameters = new object[_internalDelegate.Method.GetParameters().Length];
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if (realParameters.Length < 2) { throw new Exception("FieldDelegateMethod's internal delegate must contain at least two paramaters."); }
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if (!IsStatic) { realParameters[0] = obj; }
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realParameters[realParameters.Length - 2] = _fieldInfo;
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realParameters[realParameters.Length - 1] = parameters;
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return _internalDelegate.DynamicInvoke(realParameters);
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}
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private static object StaticInvoker(FieldInfo field, params object[] args)
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{
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Delegate del = (Delegate)field.GetValue(null);
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if (del != null) { return del.DynamicInvoke(args); }
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else { throw new Exception("Delegate was invalid and could not be invoked."); }
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}
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private object NonStaticInvoker(object obj, FieldInfo field, params object[] args)
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{
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Delegate del = (Delegate)field.GetValue(obj);
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if (del != null) { return del.DynamicInvoke(args); }
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else { throw new Exception("Delegate was invalid and could not be invoked."); }
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}
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}
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}
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