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c#linqdynamicreflection
Yahia
Yahia

Reputation: 845

'System.Type' does not contain a definition for 'GenericTypeArguments' with (dynamic)

I am trying to get the type of a dynamic linq column using 

var args = ((dynamic)linqColumn).PropertyType.GenericTypeArguments;

then comparing on the possible types names :

if (args.Length > 0 && args[0].Name == "DateTime")
    ProcessDateTimeType();
else if (args.Length > 0 && args[0].Name == "Double")
    ProcessDoubleType();

This works on a Windows Vista with .NET 4.0, but does not work with a Windows Server 2003 also with .NET 4.0. An error 'System.Type' does not contain a definition for 'GenericTypeArguments' is throwed.

I need GenericTypeArguments only for nullable types.

Any idea ?

Remarks

Upvotes: 0

Views: 1290

Answers (1)

Richard Deeming
Richard Deeming

Reputation: 31198

As Preston mentioned in the comments, the GenericTypeArguments property was added in .NET 4.5.

4.5 is an in-place upgrade to 4.0; even though you're targeting 4.0, the 4.5 APIs will still work when you use reflection or dynamic.

Try limiting the dynamic code to just the part that retrieves the property type; from that point on, you know the value is a Type, so you can use early binding:

Type propertyType = ((dynamic)linqColumn).PropertyType;

// Visual Studio should now warn you if you try to use:
// var args = propertyType.GenericTypeArguments;

var args = propertyType.IsGenericType && !propertyType.IsGenericTypeDefinition
    ? propertyType.GetGenericArguments()
    : Type.EmptyTypes;

Upvotes: 1

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