Read Trx File From C#

using System;
using System.Data;
using System.IO;
using System.Xml.Serialization;

public class YourClass
{
    public DataTable GetTestResultData()
    {
        string fileName;
        DataTable testResultTable = null;

        try
        {
            // Construct DirectoryInfo for the folder path passed in as an argument
            string baseDirectory = AppDomain.CurrentDomain.BaseDirectory;
            DirectoryInfo di = new DirectoryInfo(baseDirectory);
            ResultTable resultTable = new ResultTable();
            testResultTable = resultTable.CreateTestResultTable();

            // For each .trx file in the given folder process it
            foreach (FileInfo file in di.GetFiles("*.trx"))
            {
                fileName = file.Name;

                // Deserialize TestRunType object from the trx file
                StreamReader fileStreamReader = new StreamReader(file.FullName);
                XmlSerializer xmlSer = new XmlSerializer(typeof(TestRunType));
                TestRunType testRunType = (TestRunType)xmlSer.Deserialize(fileStreamReader);

                // Navigate to UnitTestResultType object and update the sheet with test result information
                foreach (object itob1 in testRunType.Items)
                {
                    ResultsType resultsType = itob1 as ResultsType;

                    if (resultsType != null)
                    {
                        foreach (object itob2 in resultsType.Items)
                        {
                            UnitTestResultType unitTestResultType = itob2 as UnitTestResultType;

                            if (unitTestResultType != null)
                            {
                                DataRow row = testResultTable.NewRow();
                                row[Constant.PROCESSEDFILENAME] = fileName;
                                row[Constant.TESTID] = unitTestResultType.testId;
                                row[Constant.TESTNAME] = unitTestResultType.testName;
                                row[Constant.TESTOUTCOME] = unitTestResultType.outcome;
                                row[Constant.ERRORMESSAGE] = ((System.Xml.XmlNode[])(((OutputType)(((TestResultType)(unitTestResultType)).Items[0])).ErrorInfo.Message))[0].Value;
                                testResultTable.Rows.Add(row);
                            }
                        }
                    }
                }
            }
        }
        catch (Exception)
        {
            // Handle exceptions here
        }

        return testResultTable;
    }
}

Design Source Code

I used a GridView and bound all the columns to the display. You can refer to the attached document to see the full code.

public class YourClass
{
    public void YourMethod()
    {
        // Assuming this is where you want to put the GridView creation logic
        
        GridView grdTestResult = new GridView
        {
            ID = "grdTestResult",
            runat = "server",
            CssClass = "text",
            AutoGenerateColumns = false,
            CellPadding = 5,
            GridLines = "Both",
            SelectedIndex = 0
        };

        // Adding BoundFields to the GridView
        grdTestResult.Columns.Add(new BoundField
        {
            DataField = "ProcessedFileName",
            HeaderText = "Processed File Name"
        });

        grdTestResult.Columns.Add(new BoundField
        {
            DataField = "TestID",
            HeaderText = "Test Run ID"
        });

        grdTestResult.Columns.Add(new BoundField
        {
            DataField = "TestName",
            HeaderText = "Test Name"
        });

        grdTestResult.Columns.Add(new BoundField
        {
            DataField = "TestOutcome",
            HeaderText = "Test Outcome"
        });

        // Rest of your logic goes here...

        // Assuming you want to add the GridView to a parent control
        // parentControl.Controls.Add(grdTestResult);
    }
}

Note. If you have generated a fresh C# class file from the schema then don't forget to comment the Items property of these two classes.

1. GenericTestType
2. CodedWebTestElementType

Conclusion

With the schema provided by Microsoft it's easy to parse a trx file.