CustomFunctions.Register(ICustomFunctionOperator[]) Method
Registers the specified custom functions in the Expression Editor in the End-User Report Designer.
Namespace: DevExpress.XtraReports.Expressions
Assembly: DevExpress.XtraReports.v18.2.dll
Declaration
Parameters
Name | Type | Description |
---|---|---|
functionOperators | ICustomFunctionOperator[] | A collection of ICustomFunctionOperator objects specifying custom functions to register. |
Remarks
The Register method registers a custom function in the Expression Editor to use for specifying control expression bindings and calculated fields expressions along with built-in functions.
You can declare a custom function by implementing an ICustomFunctionOperator interface that provides the base functionality. Implement an ICustomFunctionOperatorBrowsable interface if you want to specify additional function information such as a category, description or parameter count.
The following example demonstrates how to create a simple custom function and register it in the End-User Designer by calling the static Register method.
using DevExpress.XtraReports.UI;
using DevExpress.XtraReports.Expressions;
// ...
public class MyCustonFunction : ICustomFunctionOperator {
object ICustomFunctionOperator.Evaluate(params object[] operands) {
// Insert your custom logic here.
// For demonstration purposes, multiply an operand value to 10.
return (Convert.ToDouble(operands[0]) * 10);
}
string ICustomFunctionOperator.Name {
get { return "MyFunction"; }
}
Type ICustomFunctionOperator.ResultType(params Type[] operands) {
return typeof(double);
}
}
public Form1() {
// ...
CustomFunctions.Register(new MyCustonFunction());
reportDesigner1.OpenReport(new XtraReport());
}