解决方法:
1 DateFrom.Checked = true; 2 DateFrom.Value = DateTime.Today.AddDays(-7); 3 if (DateFrom.Handle == null) 4 System.Threading.Thread.Sleep(0);//防止被编译优化 5 DateFrom.Checked = false;
方法来自:
c# - Winforms DateTimePicker 设置默认文本和/或值 - 堆栈溢出 (stackoverflow.com)
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