WebApi(6) 后台C#调用WebApi

https://www.cnblogs.com/cxd1008/p/6640015.html

今天来写一下后台C#代码如何访问webapi 这里使用HttpClient方法访问webapi也是很常用的方法。

因为我在是webapi项目里直接写的，为了方便就直接读取了当前地址，代码包括 webapi的所有用法【Getstring GetClass GetListClass Post put Delete】。

代码如下：

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//后台client方式GET提交 HttpClient myHttpClient = new HttpClient(); //提交当前地址的webapi string url = "http://" + System.Web.HttpContext.Current.Request.Url.Host + ":" + System.Web.HttpContext.Current.Request.Url.Port.ToString(); myHttpClient.BaseAddress = new Uri(url); //GET提交 返回string HttpResponseMessage response = myHttpClient.GetAsync("api/ApiDemo/Get2").Result; string result = ""; if (response.IsSuccessStatusCode) {     result = response.Content.ReadAsStringAsync().Result; } //return Content(JsonConvert.SerializeObject(result));   Product product = null; //GET提交 返回class response = myHttpClient.GetAsync("api/ProductsAPI/GetProduct/1").Result; if (response.IsSuccessStatusCode) {     product = response.Content.ReadAsAsync<Product>().Result; } //return Content (JsonConvert.SerializeObject(product));   //put 提交 先创建一个和webapi对应的类            var content = new FormUrlEncodedContent(new Dictionary<string, string>()     {         {"Id","2"},         {"Name","Name:"+DateTime.Now.ToString() },         {"Category","111"},         {"Price","1"}      }); response = myHttpClient.PutAsync("api/ProductsAPI/PutProduct/2", content).Result; if (response.IsSuccessStatusCode) {     result = response.Content.ReadAsStringAsync().Result; }     //post 提交 先创建一个和webapi对应的类 content = new FormUrlEncodedContent(new Dictionary<string, string>()     {         {"Id","382accff-57b2-4d6e-ae84-a61e00a3e3b5"},         {"Name","Name" },         {"Category","111"},         {"Price","1"}      }); response = myHttpClient.PostAsync("api/ProductsAPI/PostProduct", content).Result; if (response.IsSuccessStatusCode) {     result = response.Content.ReadAsStringAsync().Result; } //delete 提交 response = myHttpClient.DeleteAsync("api/ProductsAPI/DeleteProduct/1").Result; if (response.IsSuccessStatusCode) {     result = response.Content.ReadAsStringAsync().Result; }   //GET提交 返回List<class> response = myHttpClient.GetAsync("api/ProductsAPI/GetAllProducts").Result; List<Product> listproduct = new List<Models.Product>(); if (response.IsSuccessStatusCode) {     listproduct = response.Content.ReadAsAsync<List<Product>>().Result; } return Content(JsonConvert.SerializeObject(listproduct));

　　

/// <summary>
/// url请求
/// </summary>
/// <param name="type"></param>
/// <param name="paramData"></param>
/// <returns></returns>
private static string WebRequest(string method, string type, string paramData)
{
	string apiUrl = "http://" + ConfigHelper.GetBaseUrl("url") + "/Session";
	apiUrl = apiUrl.EndsWith("/") ? apiUrl : apiUrl + "/";

	string postUrl = string.Empty;
	if (type == "Get" || type == "Delete")
	{
		postUrl = apiUrl + method + "?" + paramData;
	}
	else
	{
		postUrl = apiUrl + method;
	}
	LogWriter.ToDebug(postUrl);
	string ret = string.Empty;

	byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(paramData);
	System.Net.HttpWebRequest webReq = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(new Uri(postUrl));
	webReq.Method = type;
	switch (type)
	{
		case "Post":
			{
				webReq.ContentLength = byteArray.Length;
				webReq.ContentType = "application/json";
				System.IO.Stream newStream = webReq.GetRequestStream();
				newStream.Write(byteArray, 0, byteArray.Length); //写入参数
				newStream.Close();
			}
			break;
		case "Put":
			{
				webReq.ContentLength = byteArray.Length;
				webReq.ContentType = "application/x-www-form-urlencoded";
				System.IO.Stream newStream = webReq.GetRequestStream();
				newStream.Write(byteArray, 0, byteArray.Length); //写入参数
				newStream.Close();
			}
			break;
	}

	using (System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)webReq.GetResponse())
	{
		System.IO.StreamReader sr = new System.IO.StreamReader(response.GetResponseStream(), System.Text.Encoding.UTF8);
		ret = sr.ReadToEnd();
		sr.Close();
	}

	return ret;
}

　　

c#调用webapi post list
折腾了半天，最后用这种方式解决了。上面那种还是不会。
//请求路径
string url = "http://localhost:3063/api/Blog/SetTopNo";

//定义request并设置request的路径
WebRequest request = WebRequest.Create(url);
request.Method = "post";

//初始化request参数
string postData = "[{\"TopNo\": \"22\",\"CategoryId\": \"1\",\"BlogId\": \"1723\"}, {\"TopNo\": \"12\",\"CategoryId\": \"2\",\"BlogId\":\"1723\"}]";

//设置参数的编码格式，解决中文乱码
byte[] byteArray = Encoding.UTF8.GetBytes(postData);

//设置request的MIME类型及内容长度
request.ContentType = "application/json";
request.ContentLength = byteArray.Length;

//打开request字符流
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();

//定义response为前面的request响应
WebResponse response = request.GetResponse();

　　

问题：c#后台调用webapi接口，后面用webrequest虽然解决了传复杂类型的问题，但是写起来麻烦，还是想用httpclient，经过打断点查看header,查阅资料，加班终于搞定

var postData = new
{
Title = title,
Content = JsonConvert.SerializeObject(contentJson),
PublishFlag = "0",//发布标记:1已发布，0未发布 跟游记保持一至
LongArticle = longArticle,//复杂类型
};
var content = new StringContent(JsonConvert.SerializeObject(postData));//用的StringContent 之前用的FormUrlEncodedContent
content.Headers.ContentType = new MediaTypeHeaderValue("application/json");//关键

HttpClient httpClient = GetUseHttpClient();
//编辑，新增接口不一样
var url = "api/Blog/PublishLongArticle";
if (request.blogid!=null&&request.blogid.Trim().Length > 0)
{
url = "api/Blog/EditLongArticle";
}
var apiResponse = httpClient.PostAsync(url, content).Result;

if (apiResponse.IsSuccessStatusCode)

　　

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