DxRadioGroup<TData, TValue>.ValueExpression Property
Specifies a lambda expression that identifies the Value property’s bound value when the Radio Group is placed in the EditForm.
Namespace: DevExpress.Blazor
Assembly: DevExpress.Blazor.v24.2.dll
NuGet Package: DevExpress.Blazor
Declaration
[Parameter]
public Expression<Func<TValue>> ValueExpression { get; set; }
Property Value
Type | Description |
---|---|
Expression<Func<TValue>> | A lambda expression that identifies the bound value. |
Remarks
You can add the Radio Group component to Blazor’s standard EditForm component to validate the Value property value. In this case, the ValueExpression
property is used to obtain metadata about the value bound to the Value
property.
You should specify the ValueExpression
property if you handle the ValueChanged event and cannot use two-way binding.
<DxRadioGroup Items="@Strings"
Value="@Value"
ValueExpression="@(() => Value )"
ValueChanged="@ValueChanged">
</DxRadioGroup>
@code {
string Value = null;
// ...
void ValueChanged(string MyString) {
// ...
}
}
The ValueExpression
property is set internally if you use the @bind attribute for the Value
property to implement two-way binding.
<DxRadioGroup Items="@Languages"
@bind-Value="@PreferredLanguage"/>
<p>Preferred language:
<strong>@PreferredLanguage</strong>
</p>
@code {
string PreferredLanguage { get; set; } = "English";
IEnumerable<string> Languages = new[] { "English", "简体中文", "Español", "Français", "Deutsch" };
}