DataGridView 中的 C# FormatException

Question

我创建了一个包含一些列的 DataGridView。顺序栏只允许用户输入整数。当我输入“j”(例如)并尝试添加 try catch 来解决问题时它抛出 FormatException，但它看起来不起作用..

private void Form1_Load(object sender, EventArgs e)
{
  try{
     this.sourceTable = new DataTable(TableName);
     this.sourceTable.Columns.Add(new DataColumn(OrderCol, Type.GetType("System.Int32")));

     dataGridView1.DataSource = sourceTable;
  }catch(FormatException){
     MessageBox.Show("Please enter a number");
  }
}

Answer 1

试试这个:我添加了一个列更​​改事件，我可以在提交时检查输入。

private DataColumn dataColumn;
        private void Form1_Load(object sender, EventArgs e)
        {

                this.sourceTable = new DataTable(TableName);
                dataColumn = new DataColumn(OrderCol);
                this.sourceTable.Columns.Add(dataColumn);
                sourceTable.ColumnChanged += sourceTable_ColumnChanged; // Eventhandler for column changes

                dataGridView1.DataSource = sourceTable;

        }

        void sourceTable_ColumnChanged(object sender, DataColumnChangeEventArgs e)
        {
            try
            {
                int i = Convert.ToInt32(e.ProposedValue);

            }
            catch (FormatException)
            {
                MessageBox.Show("Please enter a number");
            }
        }