Clipboard.SetFileDropList Method (StringCollection)


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Clears the Clipboard and then adds a collection of file names in the FileDrop format.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public static void SetFileDropList(
	StringCollection filePaths


Type: System.Collections.Specialized.StringCollection

A StringCollection containing the file names.

Exception Condition

The Clipboard could not be cleared. This typically occurs when the Clipboard is being used by another process.


The current thread is not in single-threaded apartment (STA) mode. Add the STAThreadAttribute to your application's Main method.


filePaths is null.


filePaths does not contain any strings.


At least one of the strings in filePaths is Empty, contains only white space, contains one or more invalid characters as defined by InvalidPathChars, is null, contains a colon (:), or exceeds the system-defined maximum length.

See the InnerException property of the ArgumentException for more information.

A file drop list is a collection of strings containing path information for files.

A file drop list is stored on the Clipboard as a String array. This method converts filePaths to a String array before adding it to the Clipboard.

To retrieve a file drop list from the Clipboard, first use the ContainsFileDropList method to determine whether the Clipboard contains data in that format before retrieving it with the GetFileDropList method.


The Clipboard class can only be used in threads set to single thread apartment (STA) mode. To use this class, ensure that your Main method is marked with the STAThreadAttribute attribute.

The following example demonstrates this member.

// Demonstrates SetFileDropList, ContainsFileDroList, and GetFileDropList
public System.Collections.Specialized.StringCollection
    System.Collections.Specialized.StringCollection replacementList)
    System.Collections.Specialized.StringCollection returnList = null;
    if (Clipboard.ContainsFileDropList())
        returnList = Clipboard.GetFileDropList();
    return returnList;


for adding data in the FileDrop format to the system Clipboard. Associated enumeration: UIPermissionClipboard.AllClipboard


for access to the file system. Associated enumeration: FileIOPermissionAccess.PathDiscovery

.NET Framework
Available since 2.0
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