DOCVARIABLE
- 2 minutes to read
DOCVARIABLE
Mixed field
{ DOCVARIABLE “variable name” “argument1” “argument 2”… }
Inserts a string associated with a document variable.
The following members are used to obtain a DOCVARIABLE field value.
Overview
Member | Description |
---|---|
Document.Variables | DXRichEdit first searches this collection for a specified variable. |
Document.CalculateDocumentVariable | If variable is not found in the collection, the control raises this event so you can specify the value in code. |
Example: How to Handle the CalculateDocumentVariable event to insert dynamic content
This code snippet demonstrates how to handle the RichEditControl.CalculateDocumentVariable event to insert dynamic content into the document. In this example, it is used to get weather report or geo coordinates from Google web service. A variable name specified in the DOCVARIABLE field indicates a choice between location and weather, while the location itself is specified by the field argument.
Note
A complete sample project is available at https://github.com/DevExpress-Examples/dxrichedit-for-wpf-how-to-use-document-variable-docvariable-fields-e3282.
void eventHandler_CalculateDocumentVariable(object sender, CalculateDocumentVariableEventArgs e) {
string location = e.Arguments[0].Value.ToString();
Console.WriteLine(e.VariableName + " " + location);
if ((location.Trim() == String.Empty) || (location.Contains("<"))) {
e.Value = " ";
e.Handled = true;
return;
}
switch (e.VariableName) {
//case "Weather":
// Conditions conditions = new Conditions();
// conditions = Weather.GetCurrentConditions(location);
// e.Value = String.Format("Forecast for {0}: \nConditions: {1}\nTemperature (C) :{2}\nHumidity: {3}\nWind: {4}\n",
// conditions.City, conditions.Condition, conditions.TempC, conditions.Humidity, conditions.Wind);
// break;
case "Location":
GeoLocation[] loc = GeoLocation.GeocodeAddress(location);
e.Value = String.Format(" {0}\nLatitude: {1}\nLongitude: {2}\n",
loc[0].Address, loc[0].Latitude.ToString(), loc[0].Longitude.ToString());
break;
}
e.Handled = true;
}
Note
Set the event arguments’ Value property to the DocVariableValue.Current value in the CalculateDocumentVariable event handler to save the initial DOCVARIABLE field value.
Use the FieldOptions.UpdateDocVariablesBeforeCopy, Document.UpdateDocVariablesBeforePrint or the FieldOptions.UpdateDocVariablesBeforePrint properties to specify whether to update the DOCVARIABLE fields before printing or copying a range to the clipboard.