Question

I’m trying to load an xml file into the interface and there may be many exceptions based on data in Xml file, So I want to catch all the exceptions at once.
I got around 15 exceptions and display it once RichTextBox or Something else or in a MessageBox.

for (int i = 0; i < this.SortedLaneConfigs.Count; i++)
    {
         if(this.SortedLaneConfigs[i].CheckConsistency())
            {
                throw new DataConsistencyException(String.Format("Lane #{0} NOT consistent : {1}", i, e.Message)
            }
    }


if (this.SortedLaneConfigs[i - 1].EndB > this.SortedConfigs[i].BeginB)
    {
        throw new DataConsistencyException(String.Format("Lanes {0} & {1}  overlap", i - 1, i));
    }

    this.SortedLaneConfigs.ForEach(
        laneConfig =>
        {
            if (this.SortedLaneConfigs.FindAll(item => item.Id == laneConfig.Id).Count != 1)
                {
                    new DataConsistencyException(String.Format("Id \"{0}\" present more than once", laneConfig.Id));
                }
        });

I know, I can catch exception and display it in a message box, in this normal way.

 try
    {
         this.SortedLaneConfigs[i].CheckConsistency();
    }
catch (Exception e)
    {
        MessageBox.Show("Error message below: \n\"" + String.Format("Configs #{0} NOT consistent : {1}", SortedLaneConfigs[i].Id, e.Message) + "\"", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }

I googled it and i found these 2 links, link1:http://blogs.elangovanr.com/post/Catch-multiple-Exceptions-together-in-C.aspx link2:
Catch multiple exceptions at once?

How can i adapt the suggested solution from those two links to display all the exceptions at once in RichTextBox or or Something else or in a messageBox. Please help me.

Answer 1

You can concatenate the Exception.Message strings and display them wherever you like:
First create StringBuilder instance before you enter your method(s):

StringBuilder exBuilder = new StringBuilder();

Then execute your method(s) and append exceptions messages:

try
{
         this.SortedLaneConfigs[i].CheckConsistency();
}
catch (Exception e)
{
        exBuilder.Append("Error message below: \n\"" + String.Format("Configs #{0} NOT consistent : {1}", SortedLaneConfigs[i].Id, e.Message) + "\"");
        exBuilder.Append(Environment.NewLine);
}

And after you finish you can get the string with exBuilder.ToString();

richTextBox1.Text = exBuilder.ToString();

EDIT:
Suppose that you have a Form which has RichTextbox and Button on it. If the Button initiates your methods, then the use case can be like this:

public partial class Form1 : Form
{
        StringBuilder exBuilder;
        public Form2()
        {
            InitializeComponent();
            exBuilder = new StringBuilder();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            exBuilder.Clear();
            MyMethod();
            //and all your other methods that have exBuilder.Append in their try-catch blocks
            richTextBox1.Text = exBuilder.ToString();
        }

        void MyMethod()
        {
            try
            {
                //you code or whatever
            }
            catch(Exception e)
            {
                exBuilder.Append("Error message below: \n\"" + String.Format("Configs #{0} NOT consistent : {1}", parameter, e.Message) + "\"" + Environment.NewLine);
            }
        }
}