多线程中操作UI
遇到过要在工作线程中去更新UI以让用户知道进度,而在多线程中直接调用UI控件操作是错误的做法。
最后解决方法是将操作UI的代码封装,通过Invoke / BeginInvoke 去委托调用。
代码封装好的方法例子如下:
private void UpdatelblText(string str) { if (lblText.InvokeRequired) { lblText.Invoke(new Action<string>(UpdatelblText), str); } else { lblText.Text = str; } }
另外一个例子:
private void ChangeColor(int row, string ShowColor, string InvoiceStatus, string PrintStatus) { if (dataGridView1.InvokeRequired) { this.Invoke(new Action<int, string, string, string>(ChangeColor), new object[] { row, ShowColor, InvoiceStatus, PrintStatus }); } else { if (ShowColor == "Green") { dataGridView1.Rows[row].DefaultCellStyle.BackColor = Color.Green; dataGridView1.Rows[row].DefaultCellStyle.ForeColor = Color.White; } else if (ShowColor == "Yellow") { dataGridView1.Rows[row].DefaultCellStyle.BackColor = Color.Yellow; dataGridView1.Rows[row].DefaultCellStyle.ForeColor = Color.Black; } else if (ShowColor == "Red") { dataGridView1.Rows[row].DefaultCellStyle.BackColor = Color.Red; dataGridView1.Rows[row].DefaultCellStyle.ForeColor = Color.White; } dataGridView1.Rows[row].Cells[2].Value = InvoiceStatus;//开票状态 dataGridView1.Rows[row].Cells[3].Value = PrintStatus;//打印状态 } }
直接调用:
UpdatelblText("正在组织数据...");