Asp.net Can'；t从服务器调用客户端方法_Asp.net_Asp.net Core_Signalr

Asp.net Can'；t从服务器调用客户端方法

asp.net asp.net-core signalr

Asp.net Can'；t从服务器调用客户端方法,asp.net,asp.net-core,signalr,Asp.net,Asp.net Core,Signalr,我正在尝试使用signar将消息从服务器广播到客户端，而不让客户端触发消息。根据我所看到的教程，在客户端中定义方法，如下所示： signalRConnection.client.addNewMessage = function(message) { console.log(message); }; 应允许在服务器上使用以下集线器代码： public async Task SendMessage(string message) { await Clients.All.addNewM

我正在尝试使用signar将消息从服务器广播到客户端，而不让客户端触发消息。根据我所看到的教程，在客户端中定义方法，如下所示：

signalRConnection.client.addNewMessage = function(message) {
  console.log(message);
};

应允许在服务器上使用以下集线器代码：

public async Task SendMessage(string message)
{
     await Clients.All.addNewMessage("Hey from the server!");
}

但是，

Clients.All.addNewMessage

调用会在C#编译器中导致错误：

“IClientProxy”不包含“addNewMessage”的定义，并且找不到接受“IClientProxy”类型的第一个参数的可访问扩展方法“addNewMessage”（是否缺少using指令或程序集引用？）

我该如何解决这个问题？服务器代码包含在集线器中。

这是因为您使用的是ASP.NET核心信号器，但您是在ASP.NET MVC信号器之后调用客户端方法。在ASP.NET核心信号器中，必须按如下方式调用客户端方法：

public async Task SendMessage(string message)
{
     await Clients.All.SendAsync("AddNewMessage", message); // here `AddNewMessage` is the method name in the client side.
}

"use strict";

var connection = new signalR.HubConnectionBuilder().withUrl("/chatHub").build();

connection.on("AddNewMessage", function (message) {
    // do whatever you want to do with `message`
});

connection.start().catch(function (err) {
    return console.error(err.toString());
});

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddMvc()
                .SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

        services.AddSignalR(); // Must add this
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseCookiePolicy();

        app.UseSignalR(routes =>
        {
            routes.MapHub<ChatHub>("/chatHub"); // Here is configuring for `ChatHub`
        });

        app.UseMvc();
    }
}

它显示的客户端代码也是针对ASP.NET MVC Signaler的。对于ASP.NET核心信号器，应如下所示：

public async Task SendMessage(string message)
{
     await Clients.All.SendAsync("AddNewMessage", message); // here `AddNewMessage` is the method name in the client side.
}

"use strict";

var connection = new signalR.HubConnectionBuilder().withUrl("/chatHub").build();

connection.on("AddNewMessage", function (message) {
    // do whatever you want to do with `message`
});

connection.start().catch(function (err) {
    return console.error(err.toString());
});

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddMvc()
                .SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

        services.AddSignalR(); // Must add this
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseCookiePolicy();

        app.UseSignalR(routes =>
        {
            routes.MapHub<ChatHub>("/chatHub"); // Here is configuring for `ChatHub`
        });

        app.UseMvc();
    }
}

在

启动

类

信号机

中，设置应如下所示：

public async Task SendMessage(string message)
{
     await Clients.All.SendAsync("AddNewMessage", message); // here `AddNewMessage` is the method name in the client side.
}

"use strict";

var connection = new signalR.HubConnectionBuilder().withUrl("/chatHub").build();

connection.on("AddNewMessage", function (message) {
    // do whatever you want to do with `message`
});

connection.start().catch(function (err) {
    return console.error(err.toString());
});

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddMvc()
                .SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

        services.AddSignalR(); // Must add this
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseCookiePolicy();

        app.UseSignalR(routes =>
        {
            routes.MapHub<ChatHub>("/chatHub"); // Here is configuring for `ChatHub`
        });

        app.UseMvc();
    }
}

公共类启动
{
公共启动（IConfiguration配置）
{
配置=配置；
}
公共IConfiguration配置{get；}
public void配置服务（IServiceCollection服务）
{
配置（选项=>
{
//此lambda确定给定请求是否需要非必要cookie的用户同意。
options.checkApprovered=context=>true；
options.MinimumSameSitePolicy=SameSiteMode.None；
});
services.AddMvc（）
.SetCompatibilityVersion（CompatibilityVersion.Version_2_1）；
services.AddSignalR（）；//必须添加此
}
//此方法由运行时调用。请使用此方法配置HTTP请求管道。
公共无效配置（IApplicationBuilder应用程序，IHostingEnvironment环境）
{
if（env.IsDevelopment（））
{
app.UseDeveloperExceptionPage（）；
}
其他的
{
app.UseExceptionHandler（“/Error”）；
app.UseHsts（）；
}
app.UseHttpsRedirection（）；
app.UseStaticFiles（）；
app.UseCookiePolicy（）；
app.usesigner（路由=>
{
routes.MapHub（“/chatHub”）；//下面是对“chatHub”的配置`
});
app.UseMvc（）；
}
}

如果您面临进一步的问题，请遵循本教程。

这是因为您使用的是ASP.NET核心信号器，但您是在ASP.NET MVC信号器之后调用客户端方法。在ASP.NET核心信号器中，必须按如下方式调用客户端方法：

public async Task SendMessage(string message)
{
     await Clients.All.SendAsync("AddNewMessage", message); // here `AddNewMessage` is the method name in the client side.
}

"use strict";

var connection = new signalR.HubConnectionBuilder().withUrl("/chatHub").build();

connection.on("AddNewMessage", function (message) {
    // do whatever you want to do with `message`
});

connection.start().catch(function (err) {
    return console.error(err.toString());
});

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddMvc()
                .SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

        services.AddSignalR(); // Must add this
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseCookiePolicy();

        app.UseSignalR(routes =>
        {
            routes.MapHub<ChatHub>("/chatHub"); // Here is configuring for `ChatHub`
        });

        app.UseMvc();
    }
}

它显示的客户端代码也是针对ASP.NET MVC Signaler的。对于ASP.NET核心信号器，应如下所示：

public async Task SendMessage(string message)
{
     await Clients.All.SendAsync("AddNewMessage", message); // here `AddNewMessage` is the method name in the client side.
}

"use strict";

var connection = new signalR.HubConnectionBuilder().withUrl("/chatHub").build();

connection.on("AddNewMessage", function (message) {
    // do whatever you want to do with `message`
});

connection.start().catch(function (err) {
    return console.error(err.toString());
});

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddMvc()
                .SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

        services.AddSignalR(); // Must add this
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseCookiePolicy();

        app.UseSignalR(routes =>
        {
            routes.MapHub<ChatHub>("/chatHub"); // Here is configuring for `ChatHub`
        });

        app.UseMvc();
    }
}

在

启动

类

信号机

中，设置应如下所示：

public async Task SendMessage(string message)
{
     await Clients.All.SendAsync("AddNewMessage", message); // here `AddNewMessage` is the method name in the client side.
}

"use strict";

var connection = new signalR.HubConnectionBuilder().withUrl("/chatHub").build();

connection.on("AddNewMessage", function (message) {
    // do whatever you want to do with `message`
});

connection.start().catch(function (err) {
    return console.error(err.toString());
});

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddMvc()
                .SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

        services.AddSignalR(); // Must add this
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseCookiePolicy();

        app.UseSignalR(routes =>
        {
            routes.MapHub<ChatHub>("/chatHub"); // Here is configuring for `ChatHub`
        });

        app.UseMvc();
    }
}

公共类启动
{
公共启动（IConfiguration配置）
{
配置=配置；
}
公共IConfiguration配置{get；}
public void配置服务（IServiceCollection服务）
{
配置（选项=>
{
//此lambda确定给定请求是否需要非必要cookie的用户同意。
options.checkApprovered=context=>true；
options.MinimumSameSitePolicy=SameSiteMode.None；
});
services.AddMvc（）
.SetCompatibilityVersion（CompatibilityVersion.Version_2_1）；
services.AddSignalR（）；//必须添加此
}
//此方法由运行时调用。请使用此方法配置HTTP请求管道。
公共无效配置（IApplicationBuilder应用程序，IHostingEnvironment环境）
{
if（env.IsDevelopment（））
{
app.UseDeveloperExceptionPage（）；
}
其他的
{
app.UseExceptionHandler（“/Error”）；
app.UseHsts（）；
}
app.UseHttpsRedirection（）；
app.UseStaticFiles（）；
app.UseCookiePolicy（）；
app.usesigner（路由=>
{
routes.MapHub（“/chatHub”）；//下面是对“chatHub”的配置`
});
app.UseMvc（）；
}
}

如果您面临进一步的问题，请遵循本教程。

我敢肯定您正在阅读旧教程。您使用的是什么版本的信号器？对于asp.net核心信号器，请尝试

等待客户端.All.SendAsync（“ReceiveMessage”，user，message）将消息从服务器发送到客户端ReceiveMessage
是客户端中定义的方法。接下来，我使用的是SignalR Core——看起来我确实在看旧的教程。我单独解决了这个问题，但我想如果这个方法在SignalR Core中有效的话，我会保留这个问题，但似乎不是这样，我会接受下面的答案。谢谢大家！我很确定你在看老教程。您使用的是什么版本的信号器？对于asp.net核心信号器，请尝试等待客户端.All.SendAsync（“ReceiveMessage”，user，message）将消息从服务器发送到客户端ReceiveMessage
是客户端中定义的方法。接下来，我使用的是SignalR Core——看起来我确实在看旧的教程。我单独解决了这个问题，但我想如果这个方法在SignalR Core中有效的话，我会保留这个问题，但似乎不是这样，我会接受下面的答案。谢谢大家！