TreeList.AddFilter(String) Method

Adds a predefined filter with a string filtering condition to the current TreeList.

Namespace: DevExpress.XtraTreeList

Assembly: DevExpress.XtraTreeList.v24.1.dll

NuGet Packages: DevExpress.Win.Navigation, DevExpress.Win.TreeList

Declaration

C#

public void AddFilter(
    string filterString
)

VB.NET

Public Sub AddFilter(
    filterString As String
)

Parameters

Name	Type	Description
filterString	String	A String value that is the filtering condition.

Remarks

You can manually define a filter and add it to your TreeList control. The filterString parameter should be an exact filtering query. If a column’s TreeListColumn.FieldName or a filter condition is written incorrectly, the filtering will not occur. Below is an example of adding a filter via the AddFilter method:

C#

private void cmdFindRoot_Click(object sender, EventArgs e) {
            treeList1.AddFilter("[Node Name] = 'Root Node' And [Value] = 'A' And [Node Description] <> 'Secondary node'");
        }

You can also define a CriteriaOperator object and pass it to the TreeList.AddFilter method. See the method overload list to learn more.