Cannot modify the return value of 'test.getinfo.UserInfo' because it is not a variable

Cannot modify the return value of 'test.getinfo.UserInfo' because it is not a variable

• DanDro

  UserCredentials is a struct, which has what is known as "Value semantics", which means it acts just like a number. So, basically, whereever you has an object of type UserCredentials, mentally substitute a "5" to see why it isn't working:

  xmloutput += "<UserID>" + 5 + "</UserID>"; OK
  5 = "testuser"; ERROR;

  The simpliest solution would be to just make UserCredentials a class instead of a struct. (Just change "struct" to "class" in the first line)

  
  
  

• Frank Flack

  Ok, as the previous poster said, the simplest solution is to make UserCredentials a refference type (class).

  One other possible workarround is to use the following code:

  UserCredentials tempUser = getxmltext.UserInfo;

  tempUser.UserID = "someuser";

  tempUser.UserPassword = "password";

  getxmltext.UserInfo = tempUser;

  instead of:

  getxmltext.UserInfo.UserID = "testuser"; //<-- I get the error here
  getxmltext.UserInfo.UserPassword = "testpassword"; //<-- I get the error here
  

  Hope this helps.

  
  
  

• Wil Burton

  Thanks for helping me I just dont know how to setup a class in a class to raise the propteries to the forms code using that namespace.

  
  Ok here is what I did so far:
  //Ok i made a class for the usercredientials:

  public class UserCredentials
  {
  private String _UserID;

  public String UserID
  {
  get { return _UserID; }
  set { _UserID = value; }
  }
  private String _UserPassword;

  public String UserPassword
  {
  get { return _UserPassword; }
  set { _UserPassword = value; }
  }

  }

  //I also made a class for deleteshipment

  public class DeleteShipment
  {
  // I Tried this assuming that I had to setup an instance in the deleteshipment code
  
  UserCredentials UserInfo = new UserCredentials();

  private string _SoNum;

  public string SoNum
  {
  get { return _SoNum; }
  set { _SoNum = value; }
  }

  private String _UserWorkStation;

  public String UserWorkStation
  {
  get { return _UserWorkStation; }
  set { _UserWorkStation = value; }
  }
  
  public string GetXML()
  {
  return "test";
  }
  }

  When I went into the for and used this namespace I still dont see the
  userinfo properties to set them.
  
  I guess i have to make userinfo raised somehow but I am unclear on that

  :(
  
  
  Tdar

  
  

• rcurrie

  Thanks to all of you and Nimrand thanks for that extra info I will incorporate it.   I do have one other question say I wanted to so something like this. based on the stuff above, Is there a way to do as a dropdown list for setting the value, say i wanted to have set values like:

      public class UserCredentials
      {
          public String UserID;
          public String UserPassword;
          public String UserType;
             /* i would like just a list to show up of user types, Like admin, user, etc....*/
  
  }
  
  Keep in mind this is just for example, I am using microsoft's login controls for any real security.

  Tdar

  
  

• Kamen

  public class UserCredentials
  {
  public String UserID;
  public String UserPassword;
  public String UserType;
  /* i would like just a list to show up of user types, Like admin, user, etc....*/
  
  }
  

  [Tdar: you probably already know this, but for the sake of future readers...]

  In order to do this as simply as possible, you can use an enum:

  public enum UserType

  {

  Administrator,

  Regular,

  Guest

  }

  public class UserCredentials

  {

  public String UserID;

  public String UserPassword;

  public UserType UserType;

  }

  Graeme

  
  

• Seth Cohen

  James,

  Are you saying to make it a class then use a class within a class To make the functionality that I requre

  Tdar

  
  

• Ram&amp;#38;&amp;#35;243&amp;#59;n T&amp;#38;&amp;#35;233&amp;#59;bar

  This should do it.

  namespace test
  {
  public class UserCredentials
  {
  public String UserID;
  public String UserPassword;
  }
  public class getinfo
  {
  private UserCredentials _UserInfo = new UserCredentials();

  public UserCredentials UserInfo
  {
  get { return _UserInfo; }
  set { _UserInfo = value; }
  }
  public string GetXML()
  {
  string xmloutput = string.Empty;
  xmloutput += "<UserCredentials>";
  xmloutput += "<UserID>" + this.UserInfo.UserID + "</UserID>";
  xmloutput += "<UserPassword>" + this.UserInfo.UserPassword + "</UserPassword>";
  xmloutput += "</UserCredentials>";
  return xmloutput;
  }
  }
  }

  Also, a few notes on style. By convention, you should name all types using PascalCase, meaning getinfo would be GetInfo, instead. Also, type names should generally be nouns. GetInfo is a verb phrase, which is usually used for method names (because methods perform actions), but not types (because types describe objects/nouns). These kinds of rules are less important while you are still learning, but I find its much easier understand other people's code (particularly large bodies of it) when they follow the conventions established for that language.

  Hope this helps.

  
  

• cmk

  Thanks Tdar. The same problem was encountered by me.

  
  
  

• josericardo_jr

  >> Are you saying to make it a class then use a class within a class

  Yes. (Note that String is a class, and you already use that within your class)

  
  
  

• Tall Dude

  "Ok, as the previous poster said, the simplest solution is to make UserCredentials a refference type (class). "

  
  Well I understand that just I am not sure excatly how to code this, because I am way new, if someone could provide an example it to me is worth 1000 words. I have been searching high and low for an example of this on the net and in books.

  
  

• Alan Robbins

  :)

  
  

• Matt Birchall

  I know i am new to C# but this breaks it more,
  What I wanted to do was make a struct that would contain userid and password because I dont want to have to create this for ever class, I am assumeing that variable in this case means that I did not define it correcty, when I made it a class as you sujested, but this causes a runtime error of " Message="Object reference not set to an instance of an object." thats means I did not do " when i setup the reference even more problems happen.

  Let me try to explain it another way also:

  I want to have a class that has a pre setup struct for so i can do this when calling
  the class(getxmltext)

  getxmltext.UserInfo.UserPassword = "whatever"

  See code above also..

  Tdar

  maybe someone else has another way based on what I am tring to do

  
  
• Cannot modify the return value of 'test.getinfo.UserInfo' because it is not a variable