/// <summary>
/// 返回将对象从 <see cref="OriginType"/> 类型转换为 <paramref name="outputType"/> 类型的类型转换器。
/// </summary>
/// <param name="outputType">要将输入对象转换到的类型。</param>
/// <returns>将对象从 <see cref="OriginType"/> 类型转换为 <paramref name="outputType"/>
/// 类型的类型转换器，如果不存在则为 <c>null</c>。</returns>
/// <remarks>返回的委托必须符合 <see cref="Converter{TInput,TOutput}"/>，
/// 其输入类型是 <see cref="OriginType"/>，输出类型是 <paramref name="outputType"/>。</remarks>
public Delegate GetConverterTo(Type outputType)
{
if (outputType.IsEnum)
{
return(DelegateBuilder.CreateDelegate(Convert.GetConverterType(typeof(string), outputType), convertToEnumMethod));
}
switch (Type.GetTypeCode(outputType))
{
case TypeCode.Boolean:
return(new Converter <string, bool>(bool.Parse));
case TypeCode.Char:
return(new Converter <string, char>(char.Parse));
case TypeCode.SByte:
return(new Converter <string, sbyte>(sbyte.Parse));
case TypeCode.Byte:
return(new Converter <string, byte>(byte.Parse));
case TypeCode.Int16:
return(new Converter <string, short>(short.Parse));
case TypeCode.UInt16:
return(new Converter <string, ushort>(ushort.Parse));
case TypeCode.Int32:
return(new Converter <string, int>(int.Parse));
case TypeCode.UInt32:
return(new Converter <string, uint>(uint.Parse));
case TypeCode.Int64:
return(new Converter <string, long>(long.Parse));
case TypeCode.UInt64:
return(new Converter <string, ulong>(ulong.Parse));
case TypeCode.Single:
return(new Converter <string, float>(float.Parse));
case TypeCode.Double:
return(new Converter <string, double>(double.Parse));
case TypeCode.Decimal:
return(new Converter <string, decimal>(decimal.Parse));
case TypeCode.DateTime:
return(new Converter <string, DateTime>(DateTime.Parse));
case TypeCode.DBNull:
return(null);
}
return(null);
}
/// <summary>
/// 返回将对象从 <paramref name="inputType"/> 类型转换为 <see cref="OriginType"/> 类型的类型转换器。
/// </summary>
/// <param name="inputType">输入对象的类型。</param>
/// <returns>将对象从 <paramref name="inputType"/> 类型转换为 <see cref="OriginType"/>
/// 类型的类型转换器，如果不存在则为 <c>null</c>。</returns>
/// <remarks>返回的委托必须符合 <see cref="Converter{TInput,TOutput}"/>，
/// 其输入类型是 <paramref name="inputType"/>，输出类型是 <see cref="OriginType"/>。</remarks>
public Delegate GetConverterFrom(Type inputType)
{
return(DelegateBuilder.CreateDelegate(Convert.GetConverterType(inputType, typeof(string)), convertToStringMethod));
}
/// <summary>
/// 返回与指定标识符相关的处理器方法集合。
/// </summary>
/// <typeparam name="TDelegate">使用基类型调用方法的委托。</typeparam>
/// <param name="type">在其中查找静态或实例方法的类型。</param>
/// <param name="id">方法切换器的标识符。</param>
/// <param name="index">方法的关键参数索引。</param>
/// <param name="queryStatic">是否请求的是静态方法。</param>
/// <returns>与指定标识符相关的处理器方法集合。</returns>
private static Dictionary <Type, Delegate> GetMethods <TDelegate>(Type type, string id, int index, bool queryStatic)
{
Type dlgType = typeof(TDelegate);
Tuple <bool, Type, Dictionary <Type, Delegate> > data;
string key = string.Concat(type.FullName, "_", id);
if (!methodDict.TryGetValue(key, out data))
{
MethodInfo[] methods = type.GetMethods(MethodFlags);
List <MethodInfo> list = new List <MethodInfo>();
for (int i = 0; i < methods.Length; i++)
{
if (methods[i].GetCustomAttributes(typeof(ProcessorAttribute), true)
.Cast <ProcessorAttribute>().Any(s => s.Id == id))
{
list.Add(methods[i]);
}
}
int cnt = list.Count;
if (cnt == 0)
{
throw CommonExceptions.ProcessorNotFound("type", type, id);
}
bool isStatic = list[0].IsStatic;
for (int i = 1; i < cnt; i++)
{
if (list[i].IsStatic != isStatic)
{
throw CommonExceptions.ProcessorMixed("type", type, id);
}
}
Dictionary <Type, Delegate> dict = new Dictionary <Type, Delegate>();
Type newDlgType = dlgType;
if (!isStatic)
{
newDlgType = GetInstanceDlgType(newDlgType);
}
for (int i = 0; i < cnt; i++)
{
Type keyType = list[i].GetParameters()[index].ParameterType;
Delegate dlg = DelegateBuilder.CreateDelegate(newDlgType, list[i], false);
if (dlg == null)
{
throw CommonExceptions.DelegateCompatible(list[i].ToString(), dlgType);
}
dict.Add(keyType, dlg);
}
data = new Tuple <bool, Type, Dictionary <Type, Delegate> >(isStatic, dlgType, dict);
methodDict.Add(key, data);
}
if (data.Item1 != queryStatic)
{
throw CommonExceptions.ProcessorMismatch("type", type, id);
}
if (data.Item2 != dlgType)
{
// 检查委托参数。
ParameterInfo[] paramInfos = data.Item2.GetMethod("Invoke").GetParameters();
ParameterInfo[] dlgParamInfos = dlgType.GetMethod("Invoke").GetParameters();
if (paramInfos.Length != dlgParamInfos.Length)
{
throw CommonExceptions.DelegateCompatible("TDelegate", dlgType);
}
for (int i = 0; i < paramInfos.Length; i++)
{
if (paramInfos[i].ParameterType != dlgParamInfos[i].ParameterType)
{
throw CommonExceptions.DelegateCompatible("TDelegate", dlgType);
}
}
}
return(data.Item3);
}