ParameterValueChangingEventArgs<T> Class

Contains data for ***Changing events.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v25.2.dll

Declaration

public class ParameterValueChangingEventArgs<T> :
    EventArgs

Type Parameters

Name	Description
T	The data type.

Remarks

You can use ***Changing events to validate a component parameter’s new value and cancel it if needed.

In the following code, the Memo’s TextChanging event handler cancels input if the text exceeds 500 characters. The current text is updated via two-way binding (@bind-Text).

<DxMemo @bind-Text="@MemoText"
        TextChanging="@OnTextChanging"
        BindValueMode="BindValueMode.OnInput">
</DxMemo>

<div class="mt-2">
    <span>Text length: @(MemoText?.Length ?? 0)</span>
</div>

@code {
    string MemoText { get; set; }

    private void OnTextChanging(ParameterValueChangingEventArgs<string> e) {
    if (e.NewValue.Length > 500) {
        e.NewValue = e.OldValue;
    }
}

Inheritance

Object

EventArgs

ParameterValueChangingEventArgs<T>