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  1. Asked: September 8, 2021In:

    How to check if List empty or null in C#

    Hassan AbdElrahman
    Hassan AbdElrahman Master Oracle ACE Pro Alum ♠ | Oracle Senior ERP Technical Consultant
    This answer was edited.

    Check if the list is empty in C# You can check whether the list is empty or not in many ways. The first approach is to check for null, and if the count is greater than zero   Example: if (strList != null && strList.Count > 0) { Console.WriteLine("The List has " + strList.Count + " reRead more

    Check if the list is empty in C#

    You can check whether the list is empty or not in many ways.

    • The first approach is to check for null, and if the count is greater than zero

     

    Example:

    if (strList != null && strList.Count > 0)
{
Console.WriteLine("The List has " + strList.Count + " records"); 
}

    Output:

    The List has 10 records

     

    • The second approach is to use the LINQ method called “.any()”

     

    Example:

    if ((strList != null) && (!strList .Any()))
{
Console.WriteLine("The List has more than one record"); 
}

    Output:

    The List has more than one record

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  2. Asked: September 9, 2021In:

    Remove the extension from a file name in C#

    Walaa Mohamed
    Walaa Mohamed Junior

    You can use Path.GetFileNameWithoutExtension: DirectoryInfo dirInfo = new DirectoryInfo(currentDirName); FileInfo[] smFiles = dirInfo.GetFiles("*.txt"); foreach (FileInfo file in smFiles) { builder.Append(Path.GetFileNameWithoutExtension(file.Name)); builder.Append(", "); }

    You can use Path.GetFileNameWithoutExtension:

    DirectoryInfo dirInfo = new DirectoryInfo(currentDirName);
    FileInfo[] smFiles = dirInfo.GetFiles(“*.txt”);

    foreach (FileInfo file in smFiles)
    {
    builder.Append(Path.GetFileNameWithoutExtension(file.Name));
    builder.Append(“, “);
    }

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  3. Asked: September 9, 2021In:

    How to get last 4 characters from string in C#?

    Walaa Mohamed
    Walaa Mohamed Junior

    use the substring() method to get the last 4 characters str.Substring(str.Length - 4);

    use the substring() method to get the last 4 characters

    str.Substring(str.Length – 4);

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