XtraReportBase.FilterString Property
Specifies the criteria used to filter data in a report.
Namespace: DevExpress.XtraReports.UI
Assembly: DevExpress.XtraReports.v23.2.dll
NuGet Package: DevExpress.Reporting.Core
Declaration
[DefaultValue("")]
[SRCategory(ReportStringId.CatData)]
public virtual string FilterString { get; set; }Property Value
| Type | Default | Description |
|---|---|---|
| String | String.Empty | A String value, specifying the filter criteria. |
Remarks
Use the FilterString property to invoke the FilterString Editor that enables you to specify filter criteria.
At runtime, the FilterString property must be set before calling the XtraReport.CreateDocument method or any other method that calls it internally (e.g., PrintTool.ShowPreview, PrintTool.ShowPreviewDialog, PrintToolBase.Print, PrintTool.PrintDialog and all exporting methods). Setting this property is appropriate in the following event handlers.
- The XtraReportBase.DataSourceDemanded event.
- The XRControl.BeforePrint event of a report.
You can also handle the XRControl.BeforePrint event of a specific report band (e.g., the DetailBand). In this event handler, you can access the current data row using the XtraReportBase.GetCurrentRow and XtraReportBase.GetCurrentColumnValue methods and cancel printing of the band under a specific condition using the e.Cancel property.
Example
This example demonstrates how to create a report with a parameter at runtime.
After a parameter is added to a report, its value can be used in the report’s filter string or displayed in a Label control.
In Preview, users can modify the parameter value in the Parameters panel.
using System;
using System.Windows.Forms;
using DevExpress.XtraReports.UI;
using DevExpress.XtraReports.Parameters;
// ...
// Create a report instance.
XtraReport report = new XtraReport();
// Create a parameter and specify its name.
Parameter parameter1 = new Parameter();
parameter1.Name = "CategoryID";
// Specify other parameter properties.
parameter1.Type = typeof(System.Int32);
parameter1.Value = 1;
parameter1.Description = "Category: ";
parameter1.Visible = true;
// Add the parameter to the report.
report.Parameters.Add(parameter1);
// Specify the report's filter string.
report.FilterString = "[CategoryID] = ?CategoryID";
// Force the report creation without previously
// requesting the parameter value from end users.
report.RequestParameters = false;
// To access a parameter from the report's Parameters collection,
// you can either use the parameter's ID
// or the parameter name.
// Both lines below have the same effect: the parameter value is set to 5.
report.Parameters[0].Value = 5;
report.Parameters["CategoryID"].Value = 5;
// Show the parameter's value on a Report Header band.
XRLabel label = new XRLabel();
label.ExpressionBindings.Add(new ExpressionBinding("Text", "'Category: ' + ?CategoryID"));
ReportHeaderBand reportHeader = new ReportHeaderBand();
reportHeader.Controls.Add(label);
report.Bands.Add(reportHeader);
// Assign the report to a ReportPrintTool,
// to hide the Parameters panel,
// and show the report's print preview.
ReportPrintTool reportPrintTool = new ReportPrintTool(report);
reportPrintTool.ShowPreviewDialog();
The following online examples illustrate how to create multi-value parameters in code:
Related GitHub Examples
The following code snippets (auto-collected from DevExpress Examples) contain references to the FilterString property.
Note
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