/// <summary>在提供的两种方法中找到最具有针对性的方法。</summary>
/// <param name="m1">方法 1</param>
/// <param name="paramOrder1">方法 1 的参数顺序</param>
/// <param name="paramArrayType1">参数数组类型。</param>
/// <param name="m2">方法 2</param>
/// <param name="paramOrder2">方法 2 的参数顺序</param>
/// <param name="paramArrayType2">>Paramter 数组类型。</param>
/// <param name="types">要在其中进行搜索的类型。</param>
/// <param name="args">参数。</param>
/// <returns>表示匹配的 int。</returns>
internal static int FindMostSpecificMethod(
MethodBase m1,
int[] paramOrder1,
Type paramArrayType1,
MethodBase m2,
int[] paramOrder2,
Type paramArrayType2,
Type[] types,
object[] args)
{
int mostSpecific = RuntimeTypeHelper.FindMostSpecific(m1.GetParameters(), paramOrder1, paramArrayType1, m2.GetParameters(), paramOrder2, paramArrayType2, types, args);
if (mostSpecific != 0)
{
return(mostSpecific);
}
if (!RuntimeTypeHelper.CompareMethodSigAndName(m1, m2))
{
return(0);
}
int hierarchyDepth1 = RuntimeTypeHelper.GetHierarchyDepth(m1.DeclaringType);
int hierarchyDepth2 = RuntimeTypeHelper.GetHierarchyDepth(m2.DeclaringType);
if (hierarchyDepth1 == hierarchyDepth2)
{
return(0);
}
return(hierarchyDepth1 < hierarchyDepth2 ? 2 : 1);
}
/// <summary>通过提供的信息查找高度派生的类型。</summary>
/// <param name="match">候选匹配。</param>
/// <param name="cMatches">匹配数。</param>
/// <returns>派生程度最高的方法。</returns>
internal static MethodBase FindMostDerivedNewSlotMeth(
MethodBase[] match,
int cMatches)
{
int num1 = 0;
MethodBase methodBase = (MethodBase)null;
for (int index = 0; index < cMatches; ++index)
{
int hierarchyDepth = RuntimeTypeHelper.GetHierarchyDepth(match[index].DeclaringType);
if (hierarchyDepth == num1)
{
int num2 = methodBase != (MethodBase)null ? 1 : 0;
throw new AmbiguousMatchException();
}
if (hierarchyDepth > num1)
{
num1 = hierarchyDepth;
methodBase = match[index];
}
}
return(methodBase);
}
/// <summary>从当前私有类型中提取最合适的泛型方法签名。</summary>
/// <param name="methodName">要在其中搜索签名缓存的方法的名称。</param>
/// <param name="parameterTypes">与要在其中进行搜索的参数类型对应的类型数组。</param>
/// <param name="typeArguments">与泛型参数的类型对应的类型数组。</param>
/// <param name="bindingFlags"><see cref="T:System.Reflection.BindingFlags" /> 以进一步筛选方法签名。</param>
/// <param name="modifiers">参数的修饰符。</param>
/// <returns>methodinfo 实例。</returns>
private MethodInfo GetGenericMethodFromCache(
string methodName,
Type[] parameterTypes,
Type[] typeArguments,
BindingFlags bindingFlags,
ParameterModifier[] modifiers)
{
LinkedList <MethodInfo> methodCandidates = this.GetMethodCandidates(methodName, parameterTypes, typeArguments, bindingFlags, modifiers);
MethodInfo[] array = new MethodInfo[methodCandidates.Count];
methodCandidates.CopyTo(array, 0);
if (parameterTypes == null || parameterTypes.Length != 0)
{
return(RuntimeTypeHelper.SelectMethod(bindingFlags, (MethodBase[])array, parameterTypes, modifiers) as MethodInfo);
}
for (int index = 0; index < array.Length; ++index)
{
if (!RuntimeTypeHelper.CompareMethodSigAndName((MethodBase)array[index], (MethodBase)array[0]))
{
throw new AmbiguousMatchException();
}
}
return(RuntimeTypeHelper.FindMostDerivedNewSlotMeth((MethodBase[])array, array.Length) as MethodInfo);
}
/// <summary>
/// 如果给定了一组与基础条件匹配的方法，则基于
/// 类型数组选择一个方法。如果没有方法与条件匹配，此方法应
/// 返回 null。
/// </summary>
/// <param name="bindingAttr">绑定规范。</param>
/// <param name="match">候选匹配</param>
/// <param name="types">类型</param>
/// <param name="modifiers">参数修饰符。</param>
/// <returns>匹配方法。如无匹配则为 null。</returns>
internal static MethodBase SelectMethod(
BindingFlags bindingAttr,
MethodBase[] match,
Type[] types,
ParameterModifier[] modifiers)
{
if (match == null)
{
throw new ArgumentNullException(nameof(match));
}
Type[] typeArray = new Type[types.Length];
for (int index = 0; index < types.Length; ++index)
{
typeArray[index] = types[index].UnderlyingSystemType;
}
types = typeArray;
if (match.Length == 0)
{
return((MethodBase)null);
}
int num = 0;
for (int index1 = 0; index1 < match.Length; ++index1)
{
ParameterInfo[] parameters = match[index1].GetParameters();
if (parameters.Length == types.Length)
{
int index2;
for (index2 = 0; index2 < types.Length; ++index2)
{
Type parameterType = parameters[index2].ParameterType;
if (parameterType.ContainsGenericParameters)
{
if (parameterType.IsArray != types[index2].IsArray)
{
break;
}
}
else if (!(parameterType == types[index2]) && !(parameterType == typeof(object)) && !parameterType.IsAssignableFrom(types[index2]))
{
break;
}
}
if (index2 == types.Length)
{
match[num++] = match[index1];
}
}
}
if (num == 0)
{
return((MethodBase)null);
}
if (num == 1)
{
return(match[0]);
}
int index3 = 0;
bool flag = false;
int[] numArray = new int[types.Length];
for (int index1 = 0; index1 < types.Length; ++index1)
{
numArray[index1] = index1;
}
for (int index1 = 1; index1 < num; ++index1)
{
switch (RuntimeTypeHelper.FindMostSpecificMethod(match[index3], numArray, (Type)null, match[index1], numArray, (Type)null, types, (object[])null))
{
case 0:
flag = true;
break;
case 2:
flag = false;
index3 = index1;
break;
}
}
if (flag)
{
throw new AmbiguousMatchException();
}
return(match[index3]);
}
/// <summary>在提供的两种方法中找到最具有针对性的方法。</summary>
/// <param name="p1">方法 1</param>
/// <param name="paramOrder1">方法 1 的参数顺序</param>
/// <param name="paramArrayType1">参数数组类型。</param>
/// <param name="p2">方法 2</param>
/// <param name="paramOrder2">方法 2 的参数顺序</param>
/// <param name="paramArrayType2">>参数数组类型。</param>
/// <param name="types">要在其中进行搜索的类型。</param>
/// <param name="args">参数。</param>
/// <returns>表示匹配的 int。</returns>
internal static int FindMostSpecific(
ParameterInfo[] p1,
int[] paramOrder1,
Type paramArrayType1,
ParameterInfo[] p2,
int[] paramOrder2,
Type paramArrayType2,
Type[] types,
object[] args)
{
if (paramArrayType1 != (Type)null && paramArrayType2 == (Type)null)
{
return(2);
}
if (paramArrayType2 != (Type)null && paramArrayType1 == (Type)null)
{
return(1);
}
bool flag1 = false;
bool flag2 = false;
for (int index = 0; index < types.Length; ++index)
{
if (args == null || args[index] != Type.Missing)
{
Type c1 = !(paramArrayType1 != (Type)null) || paramOrder1[index] < p1.Length - 1 ? p1[paramOrder1[index]].ParameterType : paramArrayType1;
Type c2 = !(paramArrayType2 != (Type)null) || paramOrder2[index] < p2.Length - 1 ? p2[paramOrder2[index]].ParameterType : paramArrayType2;
if (!(c1 == c2) && !c1.ContainsGenericParameters && !c2.ContainsGenericParameters)
{
switch (RuntimeTypeHelper.FindMostSpecificType(c1, c2, types[index]))
{
case 0:
return(0);
case 1:
flag1 = true;
continue;
case 2:
flag2 = true;
continue;
default:
continue;
}
}
}
}
if (flag1 == flag2)
{
if (!flag1 && p1.Length != p2.Length && args != null)
{
if (p1.Length == args.Length)
{
return(1);
}
if (p2.Length == args.Length)
{
return(2);
}
}
return(0);
}
return(!flag1 ? 2 : 1);
}
