ASP. NET Web API Practice Series (ii) Get/post method call Web API

This article gives a get/post way to access the Web API, which is similar to the post call for the Put/delete method.

One, the Web API call helper Class

The following is the code for the Web API call helper class:

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Net.Http;4 usingSystem.Net.Http.Headers;5 usingSystem.Text;6 usingsystem.web;7 8 namespaceTestapi9 {Ten     /// <summary> One     ///Webapi accessing Help classes A     /// </summary> -      Public classWebapihepler -     { the         /// <summary> -         ///Generate final URL -         /// </summary> -         /// <param name= "BaseUrl" >base URL (without query string)</param> +         /// <param name= "Dictparam" >Query parameter Dictionary</param> -         /// <returns>Final URL</returns> +         Private Static stringGetlasturl (stringBASEURL, dictionary<string,string>Dictparam) A         { at             varSburl =NewStringBuilder (BASEURL); -             if(Dictparam! =NULL&& Dictparam.count >0) -             { -Sburl.append ("?"); -                 intindex =0; -                 foreach(varIteminchDictparam) in                 { -Sburl.append (string. Format ("{0}={1}", item. Key, to Httputility.urlencode (item. Value, Encoding.UTF8 )); +                     if(Index < Dictparam.count-1) -                     { theSburl.append ("&"); *                     } $index++;Panax Notoginseng                 } -             } the             varURL =sburl.tostring (); +             returnURL; A         } the  +         /// <summary> -         ///Get method call Web Api $         /// </summary> $         /// <param name= "BaseUrl" >base URL (without query string)</param> -         /// <param name= "Dictparam" >Query parameter Dictionary</param> -         /// <param name= "Result" >return Data (JSON format)</param> the         /// <param name= "ErrMsg" >error Message</param> -         /// <returns>success or not</returns>Wuyi          Public Static BOOLGet (stringBASEURL, dictionary<string,string> Dictparam, out stringResult out stringerrmsg) the         { -ErrMsg =string. Empty; Wuresult =string. Empty; -             Try About             { $                 using(varClient =NewHttpClient ()) -                 { -Client. DEFAULTREQUESTHEADERS.ACCEPT.ADD (NewMediatypewithqualityheadervalue ("Application/json")); -                     varURL =Getlasturl (BASEURL, dictparam); A                     varTmpresult =client. Getasync (URL). Result; + Tmpresult.ensuresuccessstatuscode (); theresult =TmpResult.Content.ReadAsStringAsync (). Result; -                     return true; $                 } the             } the             Catch(Exception ex) the             { theErrMsg =Ex. Message; -                 return false; in             } the              the         } About  the         /// <summary> the         ///The Post method calls the Web Api the         /// </summary> +         /// <param name= "BaseUrl" >base URL (without query string)</param> -         /// <param name= "Dictparam" >Query parameter Dictionary</param> the         /// <param name= "Parsedata" >passing Entity Data (JSON format)</param>Bayi         /// <param name= "Result" >return Data (JSON format)</param> the         /// <param name= "ErrMsg" >error Message</param> the         /// <returns>success or not</returns> -          Public Static BOOLPost (stringBASEURL, dictionary<string,string> Dictparam,stringParsedata, out stringResult out stringerrmsg) -         { theErrMsg =string. Empty; theresult =string. Empty; the             Try the             { -                 using(varClient =NewHttpClient ()) the                 { theClient. DEFAULTREQUESTHEADERS.ACCEPT.ADD (NewMediatypewithqualityheadervalue ("Application/json")); the                     varURL =Getlasturl (BASEURL, dictparam);94                     varContent =Newstringcontent (Parsedata, Encoding.UTF8); theContent. Headers.contenttype =NewMediatypeheadervalue ("Application/json"); the                     varTmpresult =client. Postasync (URL, content). Result; the Tmpresult.ensuresuccessstatuscode ();98result =TmpResult.Content.ReadAsStringAsync (). Result; About                     return true; -                 }101             }102             Catch(Exception ex)103             {104ErrMsg =Ex. Message; the                 return false;106             }107         }108     }109}

Ii. part of the explanation

Make a partial description of the above code:

• The Getlasturl method is used to obtain the final URL based on the base URL and query parameter dictionary
• Client. DEFAULTREQUESTHEADERS.ACCEPT.ADD (new Mediatypewithqualityheadervalue ("application/json")); This code indicates that you want the service to return a JSON string.
• Content. Headers.contenttype = New Mediatypeheadervalue ("application/json"); Represents the delivery of entity content in JSON format.

ASP. NET Web API Practice Series (ii) Get/post method call Web API