DxDropDownBox.EndUpdate() Method

Along with the BeginUpdate() method, allows you to modify editor property values outside the component’s markup.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v24.1.dll

NuGet Package: DevExpress.Blazor

Declaration

public void EndUpdate()

Remarks

Enclose your code between the BeginUpdate() and EndUpdate() method calls to change values of the editor’s parameters outside the component’s markup. Otherwise, an exception occurs.

Run Demo: DropDown Box - Multiple Selection ListBox

<label for="ddbMultipleSelectionListBox" class="demo-text cw-480 mb-1">Employees</label>
<DxDropDownBox @bind-Value="Value"
               QueryDisplayText="QueryText"
               DropDownWidthMode="DropDownWidthMode.EditorWidth"
               SizeMode="Params.SizeMode"
               InputId="ddbMultipleSelectionListBox"
               CssClass="cw-480"
               >
    <DropDownBodyTemplate>
        <DxListBox Data="@ListBoxData" TData="Employee" TValue="Employee"
                   Values="@(GetListBoxValues(context.DropDownBox))"
                   ValuesChanged="@(values => ListBoxValuesChanged(values, context.DropDownBox))"
                   TextFieldName="@nameof(Employee.Text)"
                   SelectionMode="ListBoxSelectionMode.Multiple"
                   ShowCheckboxes="true"
                   CssClass="templateListbox"
                   >
        </DxListBox>
    </DropDownBodyTemplate>
</DxDropDownBox>

@code {
    IEnumerable<Employee> ListBoxData { get; set; }
    object Value { get; set; }

    string QueryText(DropDownBoxQueryDisplayTextContext arg) {
        var names = (arg.Value as IEnumerable<Employee>)?.Select(x => x.LastName);
        return names != null ? string.Join(",", names) : string.Empty;
    }

    IEnumerable<Employee> GetListBoxValues(IDropDownBox dropDownBox) {
        return dropDownBox.Value as IEnumerable<Employee>;
    }

    void ListBoxValuesChanged(IEnumerable<Employee> values, IDropDownBox dropDownBox) {
        dropDownBox.BeginUpdate();
        dropDownBox.Value = values;
        dropDownBox.EndUpdate();
    }

    protected override async Task OnInitializedAsync() {
        ListBoxData = await NwindDataService.GetEmployeesAsync();
        Value = ListBoxData.Take(2);
    }
}

Implements

EndUpdate()