数据绑定格式与DateTime列

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问题描述

我有一个文本框，带有文本属性绑定到数据集列的datatype设置为system.dateTime.
结合上的格式设置为 dd-mm-yyyy .

当用户输入日期时，它试图将其转换为日期，但可能会在看似无效的日期中提出一些奇怪的值.

例如:

textBox1.Text = "01-02-200";

应该是无效的日期，但格式为 01-02-0200 .

是否有一种简单的方法可以通过设置有效范围或在绑定/文本框上覆盖事件?

推荐答案

a .NET DateTime在01/01/0001至31/12/9999 23:59:59.9999999中，因此2001/01/200被认为是有效的.

您可以验证输入并限制范围:验证事件将是进行验证的地方.您需要将字符串解析为日期时间并验证其范围.

允许的范围将取决于应用程序.例如，以下代码将DateTime限制为可以存储在SQL Server 2005 DateTime列(01-01-1753至31-12-999)中的值:

private void textBox1_Validating(object sender, CancelEventArgs e)
{
    DateTime date;
    if (!DateTime.TryParseExact(textBox1.Text, 
        "dd-MM-yyyy", 
        CultureInfo.CurrentCulture, 
        DateTimeStyles.None, 
        out date))
    {
        MessageBox.Show(textBox1.Text + " is not a valid date");
        textBox1.Focus();
        e.Cancel = true;
        return;
    }
    if ((date < (DateTime) System.Data.SqlTypes.SqlDateTime.MinValue) ||
        (date > (DateTime) System.Data.SqlTypes.SqlDateTime.MaxValue))
    {
        MessageBox.Show(textBox1.Text + " is out of range");
        textBox1.Focus();
        e.Cancel = true;
        return;
    }
}

其他推荐答案

有没有理由不使用日期选择器控件而不是文本框?将解决验证问题，并可能使用户成为更好的体验.

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问题描述

I have a textbox with the Text property bound to a dataset column with the DataType set to System.DateTime.
The FormatString on the Binding is set to dd-MM-yyyy.

When the user enters a date it attempts to convert it to a date but can come up with some strange values for a seemingly invalid date.

For example:

textBox1.Text = "01-02-200";

Should be an invalid date but it formats it as 01-02-0200.

Is there an easy way to catch these out-of-bounds values either through setting a valid range or overriding an event on the binding/textbox?

推荐答案

A .NET DateTime is in the range 01/01/0001 to 31/12/9999 23:59:59.9999999, so 01/01/200 is considered to be valid.

You can validate the input and restrict the range: the Validating event would be the place to do your validation. You'll need to parse the string into a DateTime and validate its range.

The allowed range will be application dependent. For example, the following code will restrict the datetime to values that can be stored in a SQL Server 2005 DATETIME column (01-01-1753 to 31-12-999):

private void textBox1_Validating(object sender, CancelEventArgs e)
{
    DateTime date;
    if (!DateTime.TryParseExact(textBox1.Text, 
        "dd-MM-yyyy", 
        CultureInfo.CurrentCulture, 
        DateTimeStyles.None, 
        out date))
    {
        MessageBox.Show(textBox1.Text + " is not a valid date");
        textBox1.Focus();
        e.Cancel = true;
        return;
    }
    if ((date < (DateTime) System.Data.SqlTypes.SqlDateTime.MinValue) ||
        (date > (DateTime) System.Data.SqlTypes.SqlDateTime.MaxValue))
    {
        MessageBox.Show(textBox1.Text + " is out of range");
        textBox1.Focus();
        e.Cancel = true;
        return;
    }
}

其他推荐答案

Any reason not to use a date picker control instead of a textbox? Would solve validation problem and probably make it a better experience for the user.