| public static GetNonNullableType ( this type ) : Type | ||
| type | this | |
| return | Type | |
//CONFORMING
internal static MethodInfo GetUserDefinedCoercionMethod(Type convertFrom, Type convertToType, bool implicitOnly)
{
// check for implicit coercions first
Type nnExprType = TypeUtils.GetNonNullableType(convertFrom);
Type nnConvType = TypeUtils.GetNonNullableType(convertToType);
// try exact match on types
MethodInfo[] eMethods = nnExprType.GetMethods(BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
MethodInfo method = FindConversionOperator(eMethods, convertFrom, convertToType, implicitOnly);
if (method != null)
{
return(method);
}
MethodInfo[] cMethods = nnConvType.GetMethods(BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
method = FindConversionOperator(cMethods, convertFrom, convertToType, implicitOnly);
if (method != null)
{
return(method);
}
// try lifted conversion
if (nnExprType != convertFrom || nnConvType != convertToType)
{
method = FindConversionOperator(eMethods, nnExprType, nnConvType, implicitOnly);
if (method == null)
{
method = FindConversionOperator(cMethods, nnExprType, nnConvType, implicitOnly);
}
if (method != null)
{
return(method);
}
}
return(null);
}
public static MethodInfo GetUserDefinedCoercionMethod(Type convertFrom, Type convertToType, bool implicitOnly)
{
// check for implicit coercions first
Type nnExprType = TypeUtils.GetNonNullableType(convertFrom);
Type nnConvType = TypeUtils.GetNonNullableType(convertToType);
bool retryForLifted = !AreEquivalent(nnExprType, convertFrom) || !AreEquivalent(nnConvType, convertToType);
// try exact match on types
IEnumerable <MethodInfo> eMethods = nnExprType.GetStaticMethods();
if (retryForLifted)
{
// If this may be scanned again for a lifted match, store it in a list.
eMethods = new List <MethodInfo>(eMethods);
}
MethodInfo method = FindConversionOperator(eMethods, convertFrom, convertToType, implicitOnly);
if (method != null)
{
return(method);
}
IEnumerable <MethodInfo> cMethods = nnConvType.GetStaticMethods();
if (retryForLifted)
{
cMethods = new List <MethodInfo>(cMethods);
}
method = FindConversionOperator(cMethods, convertFrom, convertToType, implicitOnly);
if (method != null)
{
return(method);
}
// try lifted conversion
if (retryForLifted)
{
return(FindConversionOperator(eMethods, nnExprType, nnConvType, implicitOnly)
?? FindConversionOperator(cMethods, nnExprType, nnConvType, implicitOnly));
}
return(null);
}
internal static bool HasReferenceConversion(Type source, Type dest)
{
Debug.Assert(source != null && dest != null);
// void -> void conversion is handled elsewhere
// (it's an identity conversion)
// All other void conversions are disallowed.
if (source == typeof(void) || dest == typeof(void))
{
return(false);
}
Type nnSourceType = TypeUtils.GetNonNullableType(source);
Type nnDestType = TypeUtils.GetNonNullableType(dest);
// Down conversion
if (nnSourceType.IsAssignableFrom(nnDestType))
{
return(true);
}
// Up conversion
if (nnDestType.IsAssignableFrom(nnSourceType))
{
return(true);
}
// Interface conversion
if (source.IsInterface || dest.IsInterface)
{
return(true);
}
// Variant delegate conversion
if (IsLegalExplicitVariantDelegateConversion(source, dest))
{
return(true);
}
// Object conversion
if (source == typeof(object) || dest == typeof(object))
{
return(true);
}
return(false);
}
public static MethodInfo GetUserDefinedCoercionMethod(Type convertFrom, Type convertToType, bool implicitOnly)
{
// check for implicit coercions first
Type nnExprType = TypeUtils.GetNonNullableType(convertFrom);
Type nnConvType = TypeUtils.GetNonNullableType(convertToType);
// try exact match on types
MethodInfo[] eMethods = nnExprType.GetStaticMethods();
MethodInfo method = FindConversionOperator(eMethods, convertFrom, convertToType, implicitOnly);
if (method != null)
{
return(method);
}
MethodInfo[] cMethods = nnConvType.GetStaticMethods();
method = FindConversionOperator(cMethods, convertFrom, convertToType, implicitOnly);
if (method != null)
{
return(method);
}
// try lifted conversion
if (!TypeUtils.AreEquivalent(nnExprType, convertFrom) ||
!TypeUtils.AreEquivalent(nnConvType, convertToType))
{
method = FindConversionOperator(eMethods, nnExprType, nnConvType, implicitOnly);
if (method == null)
{
method = FindConversionOperator(cMethods, nnExprType, nnConvType, implicitOnly);
}
if (method != null)
{
return(method);
}
}
return(null);
}