Try set custom clipboard format with string data might lead to exception due to ClipCorrespondingTypeAttribute is null

[zhuxb711]

Example:

IDataObject DataObject = NativeClipboard.CreateEmptyDataObject();
DataObject.SetData("MyCustomFormat", "My Custom String"); //Throw in here
NativeClipboard.SetDataObject(DataObject);

Vanara/PInvoke/Shell32/Clipboard.cs

Line 756 in 2829327

private static Encoding GetEncoding(ClipCorrespondingTypeAttribute attr) => (Encoding)Activator.CreateInstance(attr.EncodingType ?? typeof(UnicodeEncoding));

Replace "attr.EncodingType" with "attr?.EncodingType" should help fix this issue. Variable "attr" might be null in this case.

private static Encoding GetEncoding(ClipCorrespondingTypeAttribute attr) => (Encoding)Activator.CreateInstance(attr?.EncodingType ?? typeof(UnicodeEncoding)); 

[zhuxb711]

Looking forward to your new version 3.4.14~