WebApi(6) 后台C#調用WebApi

今天來寫一下后台C#代碼如何訪問webapi 這里使用HttpClient方法訪問webapi也是很常用的方法。

因為我在是webapi項目里直接寫的，為了方便就直接讀取了當前地址，代碼包括 webapi的所有用法【Getstring GetClass GetListClass Post put Delete】。

代碼如下：

 

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//后台client方式GET提交 HttpClient myHttpClient =  new  HttpClient(); //提交當前地址的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 先創建一個和webapi對應的類            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 先創建一個和webapi對應的類 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請求
/// </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); //寫入參數
				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); //寫入參數
				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#調用webapi post list
折騰了半天，最后用這種方式解決了。上面那種還是不會。
//請求路徑
string url = "http://localhost:3063/api/Blog/SetTopNo";

//定義request並設置request的路徑
WebRequest request = WebRequest.Create(url);
request.Method = "post";

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

//設置參數的編碼格式，解決中文亂碼
byte[] byteArray = Encoding.UTF8.GetBytes(postData);

//設置request的MIME類型及內容長度
request.ContentType = "application/json";
request.ContentLength = byteArray.Length;

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

//定義response為前面的request響應
WebResponse response = request.GetResponse();

　　

問題：c#后台調用webapi接口，后面用webrequest雖然解決了傳復雜類型的問題，但是寫起來麻煩，還是想用httpclient，經過打斷點查看header,查閱資料，加班終於搞定

var postData = new
{
Title = title,
Content = JsonConvert.SerializeObject(contentJson),
PublishFlag = "0",//發布標記:1已發布，0未發布 跟游記保持一至
LongArticle = longArticle,//復雜類型
};
var content = new StringContent(JsonConvert.SerializeObject(postData));//用的StringContent 之前用的FormUrlEncodedContent
content.Headers.ContentType = new MediaTypeHeaderValue("application/json");//關鍵

HttpClient httpClient = GetUseHttpClient();
//編輯，新增接口不一樣
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)