Blazor The name 'Invoke' doesn exist in the current context

Question

I am using Visual Studio 2019 Preview 4, .NET Core 3 RC1,

I create a Blazor web-app (server blazor), I follow https://docs.devexpress.com/Blazor/DevExpress.Blazor.Base.DxTextBoxBase.TextChanged#remarks

<DxTextBox Text="" TextChanged=@((newValue) => OnTextChanged(newValue))></DxTextBox>
<button type="button" class="btn btn-primary" disabled=@IsDisabled>Update Text</button>

@code {
    bool IsDisabled = true;

    void OnTextChanged(string newValue)
    {
        if (newValue != null)
            IsDisabled = false;

        Invoke(StateHasChanged);
    }
}

I catch error

The name 'Invoke' doesn exist in the current context

How to fix it?

Answer 1

You now need to call InvokeAsync() in its place.

This was changed in the Preview 8 release, mentioned here . Check the breaking changes at the top of that blog post, as well as those in the Preview 9 post , as you may encounter other errors from updating. There were no breaking changes from Preview 9 to RC1, and will likely be no further changes for the 3.0 release in 11 hours.

You change it to

<DxTextBox Text="" TextChanged=@((newValue) => OnTextChanged(newValue))></DxTextBox>
<button type="button" class="btn btn-primary" disabled=@IsDisabled>Update Text</button>

@code {
    bool IsDisabled = true;

    void OnTextChanged(string newValue)
    {
        if (newValue != null)
            IsDisabled = false;

        InvokeAsync(StateHasChanged);
    }
}