我如何在ASP.NET MVC Core中使用临时数据

问题描述

我需要帮助以了解使用tempdata时会发生什么情况.如果我在视图中使用tempdata，如果两个用户同步转到该视图，那么tempdata会发生什么?我的意思是，数据是否正在丢失，或者这两个临时数据是否会不同并且可以正常运行.

i need help for understand when use tempdata what happen.if i use tempdata in view , if two users synchronous go to the view , what happen for tempdata? I mean, whether the data is dropping, or whether the two tempdata will be different and will function properly.

推荐答案

这是一个示例代码，您如何实现您必须将会话中间件添加到ASP.NET Core管道中.否则，它将始终为null.您不会收到任何错误！

Here is a sample code how you can implement you have to add a Session Middleware to the ASP.NET Core Pipeline. Otherwise it always will be null. You will not get any error!

services.AddSession(); // Add in 'Startup.cs' file 'ConfigureServices' method

您还需要一个TempData提供程序.

You also need a TempData Provider.

services.AddSingleton<ITempDataProvider, CookieTempDataProvider>(); // Add in 'Startup.cs' file 'ConfigureServices' method

这是一个cookie提供程序，这意味着所有TempData内容都将放入请求A的cookie中，并在请求B中再次读取.

Here it is a cookie provider which means all TempData stuff will be put into a cookie from request A and will be read again in request B.

现在您还必须使用会话注册:

Now you also have to use the Session registration:

app.UseSession(); // Add in 'Startup.cs' file 'Configure' method

最后，您的 startup.cs 看起来像这样

Finally you your startup.cs look like this

来源

public void ConfigureServices(IServiceCollection services)
{
    // Add framework services.

    services.AddMvc();

    services.AddSingleton<ITempDataProvider, CookieTempDataProvider>();
    services.AddSession();

    // Adds a default in-memory implementation of IDistributedCache.
    services.AddDistributedMemoryCache();
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    loggerFactory.AddConsole(Configuration.GetSection("Logging"));
    loggerFactory.AddDebug();

    app.UseDeveloperExceptionPage();

    app.UseStaticFiles();

    app.UseSession();

    app.UseMvc(routes =>
    {
        routes.MapRoute(
            name: "default",
            template: "{controller=Home}/{action=Index}/{id?}");
    });
}

现在，您可以使用TempData将数据从一个动作传递到另一个动作.

Now you can use the TempData to pass data from one action to another.

public class TempDataDemoController : Controller
{
    public IActionResult RequestA()
    {
        ViewData["MyKey"] = "Hello TempData!";

        return RedirectToAction("RequestB");
    }

    public IActionResult RequestB()
    {
        return Content(ViewData["MyKey"] as string);
    }
}

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