C# webapi swagger怎样添加授权

要在C# Web API中添加授权，可以使用OAuth 2.0授权框架来实现。首先需要安装Microsoft.AspNet.WebApi.OAuth包，并在WebApiConfig中配置OAuth授权。

以下是一个简单的示例：

首先在NuGet包管理器中安装Microsoft.AspNet.WebApi.OAuth包：

Install-Package Microsoft.AspNet.WebApi.OAuth

然后在WebApiConfig中配置OAuth授权：

public static class WebApiConfig{    public static void Register(HttpConfiguration config)    {        // 配置OAuth授权        config.SuppressDefaultHostAuthentication();        config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));        // 配置Web API路由        config.MapHttpAttributeRoutes();        config.Routes.MapHttpRoute(            name: "DefaultApi",            routeTemplate: "api/{controller}/{id}",            defaults: new { id = RouteParameter.Optional }        );    }}

接下来，创建一个继承自OAuthAuthorizationServerProvider的类来实现OAuth授权逻辑：

public class CustomOAuthProvider : OAuthAuthorizationServerProvider{    public override async Task ValidateClientAuthentication(OAuthValidateClientAuthenticationContext context)    {        context.Validated();    }    public override async Task GrantResourceOwnerCredentials(OAuthGrantResourceOwnerCredentialsContext context)    {        // 验证用户名和密码        if (context.UserName == "admin" && context.Password == "admin")        {            var identity = new ClaimsIdentity(context.Options.AuthenticationType);            identity.AddClaim(new Claim(ClaimTypes.Name, context.UserName));            context.Validated(identity);        }        else        {            context.SetError("invalid_grant", "The username or password is incorrect.");            return;        }    }}

最后在Global.asax.cs中注册OAuth授权服务：

protected void Application_Start(){    GlobalConfiguration.Configure(WebApiConfig.Register);    // 配置OAuth授权服务    var oAuthServerOptions = new OAuthAuthorizationServerOptions    {        AllowInsecureHttp = true,        TokenEndpointPath = new PathString("/token"),        AccessTokenExpireTimeSpan = TimeSpan.FromDays(1),        Provider = new CustomOAuthProvider()    };    app.UseOAuthAuthorizationServer(oAuthServerOptions);    app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions());}

这样就可以在C# Web API中添加授权，并使用Swagger进行文档化。