C#中判断某类型是否可以进行隐式类型转换
作者：
在我们采用反射动态调用一些方法时，常常涉及到类型的转换，直接判断类型是否相符有时不能判断调用方法是否合适
C#中，有些类型是可以隐式转换的，我整理了这些可以隐式转换的类型，供大家参考
复制代码 代码如下:
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;
}