Write a demo on how to automatically add the following sentence to the blazor page @using ThatOtherNamespace
时间: 2024-03-09 12:45:08 浏览: 14
Sure, here's a simple demo on how to automatically add "@using ThatOtherNamespace" to a Blazor page:
1. In your Blazor project, navigate to the "wwwroot" folder and create a new folder called "utilities".
2. In the "utilities" folder, create a new file called "AutoAddNamespace.cs".
3. In the "AutoAddNamespace.cs" file, add the following code:
```
using System.Threading.Tasks;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Rendering;
namespace YourProjectNamespace.Utilities
{
public class AutoAddNamespace : ComponentBase
{
protected override async Task OnAfterRenderAsync(bool firstRender)
{
if (firstRender)
{
await JSRuntime.InvokeVoidAsync("autoAddNamespace");
}
}
[JSInvokable]
public static void AddNamespace()
{
// Get the current page's markup
var markup = RenderFragmentToString(builder =>
{
builder.OpenComponent<AutoAddNamespace>(0);
builder.CloseComponent();
});
// Check if the namespace is already added
if (!markup.Contains("@using ThatOtherNamespace"))
{
// Add the namespace to the markup
markup = markup.Replace("@page", "@using ThatOtherNamespace\n@page");
// Refresh the page with the updated markup
JSRuntime.InvokeVoidAsync("updatePageMarkup", markup);
}
}
private static string RenderFragmentToString(RenderFragment renderFragment)
{
var result = new StringBuilder();
var renderer = new HtmlRenderer(new RendererContext(new HtmlEncoder()))
{
Builder = new RenderTreeBuilder(new HtmlRenderer(new RendererContext(new HtmlEncoder()))),
NewLine = "\n"
};
renderer.Render(renderFragment);
renderer.Builder.Flush();
result.Append(renderer.Builder.ToString());
return result.ToString();
}
}
}
```
4. In your Blazor page, add the following code at the top:
```
@inject IJSRuntime JSRuntime
@using YourProjectNamespace.Utilities
```
5. At the bottom of your Blazor page, add the following code:
```
@code {
protected override void OnInitialized()
{
JSRuntime.InvokeVoidAsync("registerAddNamespaceMethod");
}
}
```
6. In the "wwwroot/index.html" file, add the following code inside the "head" tag:
```
<script>
function autoAddNamespace() {
DotNet.invokeMethodAsync("YourProjectNamespace", "AddNamespace");
}
function updatePageMarkup(markup) {
document.documentElement.innerHTML = markup;
}
function registerAddNamespaceMethod() {
DotNet.registerMethod("YourProjectNamespace", "AddNamespace", AutoAddNamespace.prototype.AddNamespace);
}
</script>
```
That's it! Now, every time the Blazor page is loaded, the "AutoAddNamespace" component will automatically check if "@using ThatOtherNamespace" is already added to the page markup. If not, it will add it and refresh the page with the updated markup.