winform系统开发总结

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1 winform中限制textbox只能输入整数或某些字符

private void tab1_tb_default_KeyPress(object sender, KeyPressEventArgs e)
{

                e.Handled = true;
                if ((e.KeyChar >= '0' && e.KeyChar <= '9')||e.KeyChar==(char)8)
                    e.Handled = false;
        }

(char)8 代表退格符，e.KeyChar=='.' 表示小数点

2 修改完datagridview中数据后仍然选中先前选中的一行

for (int i = 0; i < dataGridView1.Rows.Count; i++)
            {
                if (dataGridView1.Rows[i].Cells[0].Value.ToString().Equals(wip))
                {
                    this.dataGridView1.CurrentCell = dataGridView1.Rows[i].Cells[0];
                    return;
                }
            }

this.dataGridView1.CurrentCell----可读写，currentrow只可读，所以此处只能用currentcell

3 textbox按回车后自动到下一个控件

private void textbox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == (Char)Keys.Enter)
            {
                textbox2.focus();
            }
        }

4 Datagridview自动设置列宽

try
{
int width = 0;
for (int i = 0; i < dataGridView1.Columns.Count; i++)
{

if(datagridview1.Columns[i].Visible==true)

{
dataGridView1.AutoResizeColumn(i, DataGridViewAutoSizeColumnMode.AllCells);
width += dataGridView1.Columns[i].Width;

}
}

if (width > dataGridView1.Size.Width)
{
this.dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.DisplayedCells;
}
else
{
this.dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
}
}
catch
{ }