如何从Windows表单应用程序调用Web API登录操作

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如何从Windows表单应用程序调用Web API登录操作

我有一个简单的Web API，其中包含注册、登录和调用API模块。我想从Windows表单应用程序中调用每个功能。\n在Web API中，我使用以下JavaScript脚本调用登录方法：\n

self.login = function () {
    self.result('');
    var loginData = {
        grant_type: 'password',
        username: self.loginEmail(),
        password: self.loginPassword()
    };
    $.ajax({
        type: 'POST',
        url: '/Token',
        data: loginData
    }).done(function (data) {
        self.user(data.userName);
        // 将访问令牌缓存到会话存储中。
        sessionStorage.setItem(tokenKey, data.access_token);
    }).fail(showError);
}

\n我的控制器动作如下：\n

// POST api/Account/AddExternalLogin
[Route("AddExternalLogin")]
public async Task AddExternalLogin(AddExternalLoginBindingModel model)
{
    // ...
}
// POST api/Account/RemoveLogin
[Route("RemoveLogin")]
public async Task RemoveLogin(RemoveLoginBindingModel model)
{
    // ...
}
// GET api/Account/ExternalLogin
[OverrideAuthentication]
[HostAuthentication(DefaultAuthenticationTypes.ExternalCookie)]
[AllowAnonymous]
[Route("ExternalLogin", Name = "ExternalLogin")]
public async Task GetExternalLogin(string provider, string error = null)
{
    // ...
}
// GET api/Account/ExternalLogins?returnUrl=%2F&generateState=true
[AllowAnonymous]
[Route("ExternalLogins")]
public IEnumerable GetExternalLogins(string returnUrl, bool generateState = false)
{
    // ...
}

\n我在WinForm中使用以下代码调用登录动作：\n

HttpClient client = new HttpClient();
Uri baseAddress = new Uri("https://localhost:44305/");
client.BaseAddress = baseAddress;
ArrayList paramList = new ArrayList();
user u = new user();
u.username = username;
u.password = password;
paramList.Add(u);
HttpResponseMessage response = client.PostAsJsonAsync("api/product/SupplierAndProduct", paramList).Result;

\n在上述代码中，我尝试调用控制器动作，但失败了。为了实现我的目标，甚至从WinForm应用程序中调用JavaScript也可以。

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3 答案

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问题出现的原因是需要从Windows窗体应用程序中调用Web API登录操作。解决方法是使用HttpWebRequest和HttpWebResponse进行POST和GET请求。

以下是解决方法的代码示例：

// POST请求
var httpWebRequest = (HttpWebRequest)WebRequest.Create("path/api");
httpWebRequest.ContentType = "text/json";
httpWebRequest.Method = WebRequestMethods.Http.Post;
httpWebRequest.Accept = "application/json; charset=utf-8";
// 可能需要添加的代码
// httpWebRequest.ContentLength = json.Length;
// 发送请求
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
    // 写入POST数据
    // 你也可以使用JavaScriptSerializer将对象序列化
    streamWriter.Write(json);
    streamWriter.Flush();
}
// 获取响应
using (var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse())
{
    // 读取响应
    using (Stream stream = httpResponse.GetResponseStream())
    {
        using (StreamReader re = new StreamReader(stream))
        {
            String jsonResponce = re.ReadToEnd();
        }
    }
}
// GET请求
var httpWebRequest = (HttpWebRequest)WebRequest.Create("path/api");
httpWebRequest.ContentType = "text/json";
httpWebRequest.Method = WebRequestMethods.Http.Get;
httpWebRequest.Accept = "application/json; charset=utf-8";
// 获取响应
using (var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse())
{
    // 读取响应
    using (Stream stream = httpResponse.GetResponseStream())
    {
        using (StreamReader re = new StreamReader(stream))
        {
            String jsonResponce = re.ReadToEnd();
        }
    }
}

你也可以阅读这个SO回答获取更多信息。

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问题的原因是用户想要从Windows表单应用程序中调用Web API登录操作。他们可能遇到了一些困难，需要寻求解决方法。

解决方法可以在以下链接中找到：call web api from c sharp。

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问题原因：HttpClient类中没有名为PostAsJsonAsync的定义。

解决方法：使用System.Net.Http.Formatting扩展包，添加对Json的支持。

using System.Net.Http;
using System.Net.Http.Formatting;
HttpClient client = new HttpClient();
Uri baseAddress = new Uri("http://localhost:2939/");
client.BaseAddress = baseAddress;
ArrayList paramList = new ArrayList();
Product product = new Product { ProductId = 1, Name = "Book", Price = 500, Category = "Soap" };
Supplier supplier = new Supplier { SupplierId = 1, Name = "AK Singh", Address = "Delhi" };
paramList.Add(product);
paramList.Add(supplier);
HttpContent content = new ObjectContent(paramList, new JsonMediaTypeFormatter());
HttpResponseMessage response = client.PostAsync("api/product/SupplierAndProduct", content).Result;

以上代码使用ObjectContent和JsonMediaTypeFormatter来将参数列表转换为Json格式，并使用PostAsync方法发送请求。

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