创建一个.net 7.0类库工程，引用下面的nuget包：
<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="7.0.5" />
<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="7.0.5" />
然后把Project sdk改成这样：
<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
然后c#代码可以这样写：
using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
using Microsoft.JSInterop;
namespace WebAssemblyTest
{
public class Program
{
private static IJSRuntime js;
private static async Task Main(string[] args)
{
var builder = WebAssemblyHostBuilder.CreateDefault(args);
var host = builder.Build();
js = host.Services.GetRequiredService<IJSRuntime>();
RunInSeconds();
await host.RunAsync();
}
static async void RunInSeconds()
{
while (true)
{
await Task.Delay(2000);
//调用javascript里面的test方法
await js.InvokeVoidAsync("test", new byte[] { 0x1, 0x2 });
}
}
/// <summary>
/// 给js调用的函数
/// </summary>
/// <param name="i"></param>
/// <param name="j"></param>
/// <returns></returns>
[JSInvokable]
public static byte[] Add(int i, int j)
{
return new byte[] { (byte)i,(byte)j};
}
}
}
js代码这样写：
<html lang="en">
<head>
<meta charset="UTF-8" />
</head>
<body>
</body>
<script src="_framework/blazor.webassembly.js" autostart="false"></script>
<script>
function test(r) {
console.log(r);
alert(r);
}
window.onload = async function () {
await Blazor.start();
const r = await DotNet.invokeMethodAsync(
'WebAssemblyTest',//程序集的名字
'Add',//要调用的标注了[JSInvokable]方法的名字
666,//若干参数
333
);
console.log(r);
};
</script>
</html>
注意编译生成的_framework文件夹必须放在web服务器，并且设置mimeType以便前端可以顺利下载
var provider = new FileExtensionContentTypeProvider();
provider.Mappings[".dll"] = "application/octet-stream";//配置添加新的映射关系
provider.Mappings[".gz"] = "application/octet-stream";
provider.Mappings[".dat"] = "application/octet-stream";
provider.Mappings[".blat"] = "application/octet-stream";
provider.Mappings[".pdb"] = "application/octet-stream";
app.UseStaticFiles(new StaticFileOptions
{
ContentTypeProvider = provider,//应用新的映射关系
});