How to return an ArrayList from a WebService in C#?

Question

I have been trying to return an ArrayList from a WebService and I am confused about how to get it going as I get an error message saying

"Cannot implicitly convert type 'object[]' to 'System.Collections.ArrayList'".

Here is the Code for the Web Service names DDRParserService.asmx .

public ArrayList PVTLog(string reqNo, string groupNo, string filePath)
{
ArrayList logData = new ArrayList();

//Calling the Parsing Logic file
logData = ParsePVTLog_Service(reqNo, groupNo, filePath); 

// I get the ArrayList in logData and return it
return logData

}

The Code where I consume the Web Service:

private void btnParse_Click(object sender, EventArgs e)
{
  string strFilePath = txtOpenFile.Text;
  string serialNo = txtSerialNumber.Text;
  string groupNo = txtGroupNumber.Text;
  ArrayList data = new ArrayList();

  if (txtOpenFile.Text != "")
    {
      DDRParsingService.DDRParserService client = new DDRParsingService.DDRParserService();

      // Call the Web Service
     data =  client.PVTLog(serialNo, groupNo, strFilePath);
      // I get the error : Cannot implicitly convert type 'object[]' to 'System.Collections.ArrayList'          
    }

}

It would be great if you can help me handle this issue and access the data in the ArrayList returned by the Web Service.

Thanks in Advance!

I'd recommend using a generic List<T> over an ArrayList .... — marc_s
– marc_s, Commented Mar 1, 2017 at 21:23
I found a solution!! ....while consuming the Web Service, I can do this : ArrayList data = new ArrayList(client.PVTLog(serialNo, groupNo, strFilePath)); ..it works!! — Charles Hleas
– Charles Hleas, Commented Mar 1, 2017 at 23:19

Samy · Accepted Answer · 2017-03-01 21:41:56Z

1

on your service reference click configure:

Select your expected collection type:

click OK, then update the service reference:

answered Mar 1, 2017 at 21:41

Samy

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1 Comment

Charles Hleas Over a year ago

Hi, Thanks for the response. ..What if I have the Service Reference as a Web Reference ?

Charles Hleas · Accepted Answer · 2017-03-01 23:24:46Z

When calling the Web Service, all I had to do was declare the returned object from the Web Service as a new ArrayList.

In the above code that I have posted, I called the Web Service like this :

private void btnParse_Click(object sender, EventArgs e)
{
  string strFilePath = txtOpenFile.Text;
  string serialNo = txtSerialNumber.Text;
  string groupNo = txtGroupNumber.Text;
  ArrayList data = new ArrayList();

  if (txtOpenFile.Text != "")
    {
      DDRParsingService.DDRParserService client = new DDRParsingService.DDRParserService();

      // Call the Web Service
     data =  client.PVTLog(serialNo, groupNo, strFilePath);
      // I get the error : Cannot implicitly convert type 'object[]' to 'System.Collections.ArrayList'          
    }

}

But all I had to do was this :

data = new ArrayList(client.PVTLog(serialNo, groupNo, strFilePath));

i.e. Declare the returned object[] from the Web Service as a new ArrayList!

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