c# streamwriter generated .txt file is not completed

Question

Hi,

I have two string lists and use a c# winform app to put the list elements into a .txt file.
Those two lists have the same length. For instance, each list has 436 elements.
I can see all elements are generated in the VS2019.

However, in the generated .txt file, the last few elements are not there. This screenshot indicates the file is cut at M429. Sometimes, it is cut at M434. It varies randomly.

Is there a limitation somewhere? Could you please help on this issue? Thanks.

Here is the code:

                List<string> listTag = new List<string>();//List of Tag  
                List<string> listDes = new List<string>();//List of Description  
                    string strTxtName = strPrjPath + "\\Alm_Cfg.txt";  
                    if (File.Exists(strTxtName)) File.Delete(strTxtName);  
                    StreamWriter sw = File.CreateText(strTxtName);  
                    sw.WriteLine("<triggers>");  
                    for (int i = 1; i <= listTag.Count; i++)  
                    {  
                        sw.WriteLine("<trigger id=\"T" + i.ToString() + "\" type=\"value\" ack-all-value=\"0\" use-ack-all=\"false\" ack-tag=\"\" exp=\"{[" + tbxDevSC.Text + "]" + listTag[i - 1] + "}\" message-tag=\"\" message-handshake-exp=\"\" message-notification-tag=\"\" remote-ack-exp=\"\" remote-ack-handshake-tag=\"\" label=\"" + listTag[i - 1] + "\" handshake-tag=\"\"/>");  
                    }  
                    sw.WriteLine("</triggers>");  
                    sw.WriteLine("<messages>");  
                    for (int i = 1; i <= listTag.Count; i++)  
                    {  
                        sw.WriteLine("<message id=\"M" + i.ToString() + "\" trigger-value=\"1\" identifier=\"" + i + "\" trigger=\"#T" + i + "\" backcolor=\"#800000\" forecolor=\"#FFFFFF\" audio=\"false\" display=\"true\" print=\"false\" message-to-tag=\"false\" text=\"" + listDes[i - 1] + "\"/>");  
                    }  
                    sw.WriteLine("</messages>");  

Answer 1

Do you Close the StreamWriter object?

sw.Close();

StreamWriter.Close Method

https://learn.microsoft.com/en-us/dotnet/api/system.io.streamwriter.close?view=net-5.0#System_IO_StreamWriter_Close

"You must call Close to ensure that all data is correctly
written out to the underlying stream."

• Wayne

Answer 2

You can also wrap the StreamWriter in a using statement, which provides a convenient syntax that ensures the correct use of IDisposable objects.

            using (StreamWriter sw = File.CreateText(strTxtName))  
            {  
                ......  
            }     

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