StatusHasChanged in .razor.cs

StatusHasChanged in .razor.cs

The StatusHasChanged method is a method of the ComponentBase class in the Blazor framework. This method is used to notify the framework that the component's state has changed, and that the component's view should be re-rendered.

The StatusHasChanged method is typically called whenever a component's state changes in a way that affects the component's view. For example, if a component has a property that is bound to an input element in the view, and the value of the property changes, the StatusHasChanged method should be called to ensure that the view is updated with the new value.

Here is an example of how the StatusHasChanged method can be used in a Blazor component:

@page "/counter"

@using Microsoft.AspNetCore.Components

<h1>Counter</h1>

<p>Current count: @currentCount</p>

<button @onclick="IncrementCount">Click me</button>

@code {
    private int currentCount = 0;

    private void IncrementCount()
    {
        currentCount++;
        StatusHasChanged();
    }
}

In this example, the StatusHasChanged method is called in the IncrementCount method whenever the value of the currentCount property is incremented. This causes the view to be re-rendered, updating the currentCount value displayed in the view

 

The new added .razor missing .razor.cs

If you have added a new Razor page to a Blazor project in Visual Studio, but the page is missing the .razor.cs file, it's possible that you have selected the wrong template when creating the page.

By default, when you create a new Razor page in a Blazor project, Visual Studio will create both the .razor file and the .razor.cs file. The .razor file contains the HTML markup and C# code for the page's layout, while the .razor.cs file contains the C# code for the page's logic and behavior.

However, if you have selected the Razor Page (without .NET Core) template when creating the page, Visual Studio will only create the .razor file, and will not create the .razor.cs file. This is because this template is intended for use with traditional Razor pages in ASP.NET Core, which do not have a separate code-behind file.

To fix this issue, you can simply add a new Razor page to your project again, but this time make sure to select the Razor Page template instead of the Razor Page (without .NET Core) template. This will create both the .razor and .razor.cs files for the page, allowing you to add both layout and behavior to the page.

Alternatively, if you have already created the page using the wrong template, you can simply add a new .razor.cs file to your project and move the C# code from the .razor file into the new .razor.cs file. This will allow you to separate the page's layout and behavior into separate files, which can make the code easier to maintain and understand.

 

 

作者:Chuck Lu    GitHub