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C#中判斷某類型是否可以進(jìn)行隱式類型轉(zhuǎn)換

更新時(shí)間：2013年04月26日 15:16:19 作者：

在我們采用反射動(dòng)態(tài)調(diào)用一些方法時(shí)，常常涉及到類型的轉(zhuǎn)換，直接判斷類型是否相符有時(shí)不能判斷調(diào)用方法是否合適

C#中，有些類型是可以隱式轉(zhuǎn)換的，我整理了這些可以隱式轉(zhuǎn)換的類型，供大家參考

     static private bool CanConvert(Type from, Type to)
    {
       if (from.IsPrimitive && to.IsPrimitive)
          {
   TypeCode typeCodeFrom = Type.GetTypeCode(from);
   TypeCode typeCodeTo = Type.GetTypeCode(to);
   if (typeCodeFrom == typeCodeTo)
   return true;
   if (typeCodeFrom == TypeCode.Char)
   switch (typeCodeTo)
   {
   case TypeCode.UInt16: return true;
   case TypeCode.UInt32: return true;
   case TypeCode.Int32: return true;
   case TypeCode.UInt64: return true;
   case TypeCode.Int64: return true;
   case TypeCode.Single: return true;
   case TypeCode.Double: return true;
   default: return false;
   }
   // Possible conversions from Byte follow.
   if (typeCodeFrom == TypeCode.Byte)
   switch (typeCodeTo)
   {
   case TypeCode.Char: return true;
   case TypeCode.UInt16: return true;
   case TypeCode.Int16: return true;
   case TypeCode.UInt32: return true;
   case TypeCode.Int32: return true;
   case TypeCode.UInt64: return true;
   case TypeCode.Int64: return true;
   case TypeCode.Single: return true;
   case TypeCode.Double: return true;
   default: return false;
   }
   // Possible conversions from SByte follow.
   if (typeCodeFrom == TypeCode.SByte)
   switch (typeCodeTo)
   {
   case TypeCode.Int16: return true;
   case TypeCode.Int32: return true;
   case TypeCode.Int64: return true;
   case TypeCode.Single: return true;
   case TypeCode.Double: return true;
   default: return false;
   }
   // Possible conversions from UInt16 follow.
   if (typeCodeFrom == TypeCode.UInt16)
   switch (typeCodeTo)
   {
   case TypeCode.UInt32: return true;
   case TypeCode.Int32: return true;
   case TypeCode.UInt64: return true;
   case TypeCode.Int64: return true;
   case TypeCode.Single: return true;
   case TypeCode.Double: return true;
   default: return false;
   }
   // Possible conversions from Int16 follow.
   if (typeCodeFrom == TypeCode.Int16)
   switch (typeCodeTo)
   {
   case TypeCode.Int32: return true;
   case TypeCode.Int64: return true;
   case TypeCode.Single: return true;
   case TypeCode.Double: return true;
   default: return false;
   }
   // Possible conversions from UInt32 follow.
   if (typeCodeFrom == TypeCode.UInt32)
   switch (typeCodeTo)
   {
   case TypeCode.UInt64: return true;
   case TypeCode.Int64: return true;
   case TypeCode.Single: return true;
   case TypeCode.Double: return true;
   default: return false;
   }
   // Possible conversions from Int32 follow.
   if (typeCodeFrom == TypeCode.Int32)
   switch (typeCodeTo)
   {
   case TypeCode.Int64: return true;
   case TypeCode.Single: return true;
   case TypeCode.Double: return true;
   default: return false;
   }
   // Possible conversions from UInt64 follow.
   if (typeCodeFrom == TypeCode.UInt64)
   switch (typeCodeTo)
   {
   case TypeCode.Single: return true;
   case TypeCode.Double: return true;
   default: return false;
   }
   // Possible conversions from Int64 follow.
   if (typeCodeFrom == TypeCode.Int64)
   switch (typeCodeTo)
   {
   case TypeCode.Single: return true;
   case TypeCode.Double: return true;
   default: return false;
   }
   // Possible conversions from Single follow.
   if (typeCodeFrom == TypeCode.Single)
   switch (typeCodeTo)
   {
   case TypeCode.Double: return true;
   default: return false;
   }
   }
   return false;
   }

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