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78 lines
2.5 KiB
78 lines
2.5 KiB
using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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using System.Threading.Tasks;
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namespace IPA.Utilities
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{
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/// <summary>
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/// A class to store a reference for passing to methods which cannot take ref parameters.
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/// </summary>
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/// <typeparam name="T">the type of the value</typeparam>
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public class Ref<T>
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{
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private T _value;
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/// <summary>
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/// The value of the reference
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/// </summary>
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public T Value
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{
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get
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{
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if (Error != null) throw Error;
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return _value;
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}
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set => _value = value;
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}
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private Exception _error = null;
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/// <summary>
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/// An exception that was generated while creating the value.
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/// </summary>
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public Exception Error
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{
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get
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{
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return _error;
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}
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set
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{
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value.SetStackTrace(new StackTrace(1));
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_error = value;
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}
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}
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/// <summary>
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/// Constructor.
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/// </summary>
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/// <param name="reference">the initial value of the reference</param>
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public Ref(T reference)
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{
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_value = reference;
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}
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/// <summary>
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/// Throws error if one was set.
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/// </summary>
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public void Verify()
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{
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if (Error != null) throw new Exception("Found error", Error);
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}
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}
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internal static class ExceptionUtilities
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{
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private static readonly FieldInfo STACK_TRACE_STRING_FI = typeof(Exception).GetField("_stackTraceString", BindingFlags.NonPublic | BindingFlags.Instance);
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private static readonly Type TRACE_FORMAT_TI = Type.GetType("System.Diagnostics.StackTrace").GetNestedType("TraceFormat", BindingFlags.NonPublic);
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private static readonly MethodInfo TRACE_TO_STRING_MI = typeof(StackTrace).GetMethod("ToString", BindingFlags.NonPublic | BindingFlags.Instance, null, new[] { TRACE_FORMAT_TI }, null);
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public static Exception SetStackTrace(this Exception target, StackTrace stack)
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{
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var getStackTraceString = TRACE_TO_STRING_MI.Invoke(stack, new object[] { Enum.GetValues(TRACE_FORMAT_TI).GetValue(0) });
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STACK_TRACE_STRING_FI.SetValue(target, getStackTraceString);
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return target;
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}
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}
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}
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