C＃中出现FormatException中的DataGridView [英] C# FormatException in DataGridView

问题描述

我创造了一些列的DataGridView。顺序列只允许用户输入整型数字。它抛出出现FormatException当我输入J（例如），我尝试添加尝试捕捉来解决这个问题，但看起来不起作用。

 私人无效Form1_Load的（对象发件人，EventArgs的）
{
  尝试{
     this.sourceTable =新的DataTable（表名）;
     this.sourceTable.Columns.Add（新的DataColumn（OrderCol，Type.GetType（System.Int32的）））;

     dataGridView1.DataSource = sourceTable;
  }赶上（出现FormatException）{
     的MessageBox.show（请输入一个数字）;
  }
}
 

解决方案

试试这个： 我已经添加了一个事件列变化，我可以确认输入时，它的提交。

 私人的DataColumn的DataColumn;
        私人无效Form1_Load的（对象发件人，EventArgs的）
        {

                this.sourceTable =新的DataTable（表名）;
                的DataColumn =新的DataColumn（OrderCol）;
                this.sourceTable.Columns.Add（的DataColumn）;
                sourceTable.ColumnChanged + = sourceTable_ColumnChanged; //事件处理程序的列变化

                dataGridView1.DataSource = sourceTable;

        }

        无效sourceTable_ColumnChanged（对象发件人，DataColumnChangeEventArgs E）
        {
            尝试
            {
                INT I = Convert.ToInt32（e.ProposedValue）;

            }
            赶上（出现FormatException）
            {
                的MessageBox.show（请输入一个数字）;
            }
        }
 

I created a DataGridView with some columns. The order columns only allow users enter int number. It throws the FormatException when I enter "j" (for example) and I try to add try catch to fix the problem, but it looks does not work..

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");
  }
}

解决方案

Try this: I've added an event for column changing where I can check the input when it's submitted.

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");
            }
        }

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