刷新数据网格WPF。 ItemsSource和Items.Refresh（）不起作用

Question

I have simple application and I import data from excel file to data grid. Here is code:

private void InitializeDataGridView()
    {
        //Open the Excel file using ClosedXML.
        using (XLWorkbook workBook = new XLWorkbook(ExcelFile.ExcelFilePath))
        {
            //Read the first Sheet from Excel file.
            IXLWorksheet workSheet = workBook.Worksheet(1);

            //Create a new DataTable.
            DataTable dt = new DataTable();

            //Loop through the Worksheet rows.
            bool firstRow = true;
            foreach (IXLRow row in workSheet.Rows())
            {
                //Use the first row to add columns to DataTable.
                if (firstRow)
                {
                    foreach (IXLCell cell in row.Cells())
                    {
                        dt.Columns.Add(cell.Value.ToString());
                    }
                    firstRow = false;
                }
                else
                {
                    //Add rows to DataTable.
                    dt.Rows.Add();
                    int i = 0;
                    foreach (IXLCell cell in row.Cells())
                    {
                        dt.Rows[dt.Rows.Count - 1][i] = cell.Value.ToString();
                        i++;
                    }
                }

                dtGrid.ItemsSource = dt.DefaultView;
            }
        }
    }

It works fine. But I want to add some data. Im using this code:

public static void AddData(DateTime date, int time, string title, string description)
    {
        // Opening excel file        
        using (XLWorkbook workBook = new XLWorkbook(ExcelFile.ExcelFilePath))
        {              
            IXLWorksheet worksheet = workBook.Worksheet("Progress"); // Trying to get the Progress worksheet
            // Getting table from DataTable
            var dataTable = GetTable(date, time, title, description);
            // Searching for last used row and first used column
            var lastRowUsed = worksheet.LastRowUsed().RowNumber();
            var firstColumnUsed = worksheet.FirstColumnUsed().ColumnNumber();
            // Insterting data               
            worksheet.Cell(lastRowUsed + 1, firstColumnUsed).InsertData(dataTable.AsEnumerable());

            // Adjusting content to fit
            worksheet.Columns().AdjustToContents();
            // Saving excel file
            workBook.Save();
        }

    }

    public static DataTable GetTable(DateTime date, int time, string title, string description)
    {
        DataTable table = new DataTable();
        table.Columns.Add("Data", typeof(DateTime));
        table.Columns.Add("Czas(minuty)", typeof(int));
        table.Columns.Add("Tytuł", typeof(string));
        table.Columns.Add("Opis", typeof(string));

        table.Rows.Add(date, time, title, description);
        return table;
    }

And it's work fine. I have problem with my data grid. Its not updating after I add something to the excel file.

I tried to do something like that:

dtGrid.ItemsSource = null;
InitializeDataGridView();

It wasnt working. I used also dtGrid.Items.Refresh(); , it wasnt working. How can I refresh my data grid after adding data to excel file?

Answer 1

InitializeDataGridView() has dataGrid.ItemsSource referencing a dataTable dt.DefaultView.

I don't see the same datatable being used in adding new data. If you create new dataTable and add data to it, It needs to be reconnected as new reference of ItemsSource.

I would suggest rather use same ItemsSource throughout the session displaying the dataGrid.