Wrote a special method of uploaded files in the control, the direct external call no problem, but in another controller calls this method suggests that the System. NullReferenceException: Object reference not set to an instance of an Object. mistake, say this line has a problem: var files=Request. Form. The files; , I do not know is to call in the right way, or what the reason, thank you please people copies, with two methods of code is as follows:

This is upload dedicated controller methods

 public async Task UploadFile () 
{
//Web root directory 
String webRootPath=ConfigHelper. GetConfig (" ImgPath "); 
Var date=Request; 
Var files.=the Request Form. The files; 
Long size=files. The Sum (f=& gt; F.L ength); 
String shortTime=DateTime. Now. ToString (" yyyy/MM/dd ") + "/". 
String filePhysicalPath=webRootPath + "/Content/GTP/made" + shortTime;//file path can be achieved by injecting IHostingEnvironment service object physical path of the root directory the root directory of the Web and content 
. . 
Using (var stream=new FileStream (filePhysicalPath + fileName, FileMode. Create)) 
{
Await the file. CopyToAsync (stream); 
} 
} 
} 
JObject job=new JObject (); 
Job. The Add (new JProperty (" data ", jFile)); 
Return Ok (job. The ToString ()); 
} 

Another controller is the method called such

 private UpFileController _upFileController; 
Public datacenterController (UpFileController UpFileController) 
{
_upFileController=upFileController; 
} 


Public async Task AddChord2 () 
{



Var t=await _upFileController. UploadFile (); 
Return Ok (t.T oStr ()); 






} 

CodePudding user response:

The general is a class instance into a Null, will appear in this kind of circumstance

CodePudding user response:

Directly set a breakpoint debugging your own Request. The Form,