在C＃的下拉列表中选择随机字符串

Question

I am trying to figure out how to have my method randomly select an account type from a drop down list. Basically in my web application the user will choose: active, inactive, prospect, or suspended from a drop down list. What I am trying to do is test this functionality and have my method randomly select a value when I run the test.

I am having a hard time referencing the method to the string value in the code if this makes sense. Any help would be great and if you need additional information let me know!

Here is what I have so far:

   public void RandomStatusTypes()
     {
         List<string> statusTypes = new List<string> { "ACTIVE", "INACTIVE", "PROSPECT", "SUSPENDED" };
         Random randStatus = new Random();
         int index = randStatus.Next(0, 6);
         string value = statusTypes[index];
     }

The code will have a line saying StatusTyp = _Status, and hopefully I can assign a random status to the value so everytime I run the program it randomly picks a value.

Thank you!

Answer 1

Perhaps:

private static List<string> StatusTypes = new List<string>(){ "ACTIVE", "INACTIVE", "PROSPECT", "SUSPENDED" };
private static Random randStatus = new Random();

public string RandomStatusTypes()
{
    int index = randStatus.Next(0, StatusTypes.Count);
    return StatusTypes[index];
}

Don't create the random instance in the method itself. Otherwise you will create the same statuses when the method is called very fast(fe in a loop). You should use a field(as shown above) or pass the random as argument to the method.

I've also moved the list outside of the method since it's ineffective to create it always when it doesn't change anyway. Last i've used StatusTypes.Count to ensure that you always use a valid range even if you will change the list in future(fe add new statuses).

Answer 2

If you're just interested in selecting a value from the DropdownList, you should just randomly change the SelectedIndex property:

 Random randStatus = new Random();
 public void RandomStatusTypes()
 {
          ddlStatus.SelectedIndex = randStatus.Next(ddlStatus.Items.Count);
 }

This will randomly change to any value in the dropdown. Notice it uses ddlStatus.Items.Count so if you ever add or remove items, you won't have to modify this code.

Answer 3

If you need random value for the DropdownList, you should set the SelectedIndex property to a random number

   public void RandomStatusTypes()
     {
         List<string> statusTypes = new List<string> { "ACTIVE", "INACTIVE", "PROSPECT", "SUSPENDED" };
         Random randStatus = new Random();
         dropList.Items.AddRange(statusTypes);
         dropList.SelectedIndex = randStatus.Next(0, 3);
     }

Answer 4

Try this function which returns a random item from the passing myList

public string RandomListItem(List<string> myList)
{
    int randNo = new Random().Next(0, myList.Count());
    return myList[randNo];
}

Answer 5

First of all you need to return an index from that method ( void = it returns nothing ) to use as a selected value for your DropDownList .

public int RandomStatusTypes()
 {
     List<string> statusTypes = new List<string> { "ACTIVE", "INACTIVE", "PROSPECT", "SUSPENDED" };
     Random randStatus = new Random();
     return randStatus.Next(0, statusTypes.Count);
 }

After that you can call that method somewhere like this

  var statusForDropDown= RandomStatusTypes(); 

And assign statusForDropDown to your DropDownList

     MyDropDownList.SelectedIndex=statusForDropDown;