/// <summary>
/// 基于提供的参数，从给定的方法集中选择要调用的方法。
/// </summary>
/// <param name="bindingAttr"><see cref="BindingFlags"/> 值的按位组合。</param>
/// <param name="match">用于匹配的候选方法集。</param>
/// <param name="args">传入的参数。</param>
/// <param name="modifiers">使绑定能够处理在其中修改了类型的参数签名的参数修饰符数组。</param>
/// <param name="culture">一个 <see cref="CultureInfo"/> 实例，
/// 用于在强制类型的联编程序实现中控制数据类型强制。</param>
/// <param name="names">参数名（如果匹配时要考虑参数名）或 <c>null</c>（如果要将变量视为纯位置）。</param>
/// <param name="state">方法返回之后，<paramref name="state"/> 包含一个联编程序提供的对象，
/// 用于跟踪参数的重新排序。</param>
/// <returns>匹配的方法。</returns>
/// <exception cref="ArgumentNullException"><paramref name="match"/> 为 <c>null</c>。</exception>
/// <exception cref="ArgumentNullException"><paramref name="args"/> 为 <c>null</c>。</exception>
/// <exception cref="ArgumentException"><paramref name="match"/> 为空数组。</exception>
/// <exception cref="ArgumentException"><paramref name="match"/> 中包含为 <c>null</c> 的元素。</exception>
/// <exception cref="AmbiguousMatchException"><paramref name="match"/> 包含多个与 <paramref name="args"/>
/// 匹配程度相同的方法。</exception>
/// <exception cref="MissingFieldException"><paramref name="bindingAttr"/> 包含
/// <see cref="BindingFlags.SetField"/>，且 <paramref name="match"/> 不包含任何可接受 <paramref name="args"/>
/// 的方法。</exception>
public override MethodBase BindToMethod(BindingFlags bindingAttr, MethodBase[] match, ref object[] args,
ParameterModifier[] modifiers, CultureInfo culture, string[] names, out object state)
{
CommonExceptions.CheckCollectionItemNull(match, "match");
CommonExceptions.CheckArgumentNull(args, "args");
if (names != null && names.Length > args.Length)
{
throw CommonExceptions.NamedParamTooBig("names");
}
Contract.EndContractBlock();
// 检查参数名称数组，不能出现名称相同的参数。
if (names != null && !names.IsDistinct(StringComparer.Ordinal))
{
throw CommonExceptions.DuplicateName("names");
}
MethodArgumentsOption options = MethodArgumentsOption.None;
if (isExplicit)
{
options |= MethodArgumentsOption.Explicit;
}
if (bindingAttr.HasFlag(BindingFlags.OptionalParamBinding))
{
options |= MethodArgumentsOption.OptionalParamBinding;
}
int typesLen = args.Length;
Type[] types = new Type[typesLen];
for (int i = 0; i < typesLen; i++)
{
object arg = args[i];
types[i] = arg == null ? null : arg.GetType();
}
MethodMatchInfo[] infos = new MethodMatchInfo[match.Length];
MethodMatchInfo info;
int length = 0;
for (int i = 0; i < match.Length; i++)
{
int[] paramOrder = null;
if (names != null)
{
paramOrder = CreateParamOrder(match[i], names, typesLen);
if (paramOrder == null)
{
continue;
}
}
info = MethodMatchInfo.GetMatchInfo(match[i], types, paramOrder, options);
if (info != null)
{
infos[length++] = info;
}
}
if (length == 0)
{
// 没有可匹配的方法。
state = null;
throw CommonExceptions.MissingMethod();
}
info = SelectMethod(infos, length, types);
if (info == null)
{
state = null;
throw CommonExceptions.AmbiguousMatchMethod();
}
UpdateArgs(info, ref args, out state);
return(info.Method);
}