WPF FAQ - Drag and Drop

Data from a Dataobject can be retrieved using the overloads of ‘GetDataPresent()’ method in the DataObject.

The following overloads can be used to retrieve the data from a DataObject.

• GetDataPresent (DataFormat) – It first checks whether the data of the specified format is available. If so, it retrieves the data using the ‘GetData(DataFormat)’ method.

[C#]

dataobject.GetDataPresent(DataFormats.UnicodeText);

• GetDataPresent (DataFormat, auto-conversion) – It first checks whether the data of the specified format is available. If so, it retrieves the data using the ‘GetData(DataFormat)’ method. It also filters the auto-convertible data in the DataObject.

[C#]

dataobject.GetDataPresent(DataFormats.UnicodeText,false);

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A DataObject can be created in three different overloads of the DataObject constructor.

• DataObject (object) – In this case, appropriate DataFormat is assigned to the DataObject based on the type of data stored in the object. By default, auto-conversion option is set to ’true’.

[C#]

string mystring = 'Drag and Drop String Object';
DataObject dataobject = new DataObject(mystring);

• DataObject (DataFormat, object) – In this case, DataFormat is mentioned when the DataObject is created.

[C#]

string mystring = 'Drag and Drop String Object';
DataObject dataobject = new DataObject(DataFormats.UnicodeText,mystring);

• DataObject (DataFormat, Object, auto-conversion) – In this case, DataFormat, Object and Auto-Conversion Boolean value are mentioned when the DataObject is created.

[C#]

string mystring = 'Drag and Drop String Object';
DataObject dataobject = new DataObject(DataFormats.UnicodeText,mystring,false);

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The following are the some of the objects involved in the DragandDrop process.

• Drag Source – Object from which an object is dragged from.

• Drag Object – An object which is dragged.

• Drag Target – Object into which the dragged object is dropped.

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