错误:无法将类型'string'隐式转换为'System.DateTime'

问题描述

dateTimePicker1.Value = dss.Tables["ITdata"].Rows[0]["pudate"].ToString();

推荐答案

dateTimePicker1.Value = dss.Tables["ITdata"].Rows[0]["pudate"].ToString();

如果已经是一个DateTime，则只需取消ToString-将日期强制转换为字符串是一个不好的主意，除非您要显示它们，否则以后可能会产生本地化问题.

If it is already a DateTime, then just take the ToString off - it is a bad idea to start casting dates to strings unless you are about to display them, and it can create localisation problems later.

dateTimePicker1.Value = dss.Tables["ITdata"].Rows[0]["pudate"];

如果它是一个DateTime，但作为通用object返回，则将其强制转换:

If it is a DateTime, but it is returned as a generic object then cast it:

dateTimePicker1.Value = (DateTime) dss.Tables["ITdata"].Rows[0]["pudate"];

如果它是字符串，则需要解析该字符串，并希望该字符串格式与您的本地系统相同！ :laugh:如果是特定的字符串格式，则可以使用DateTime.ParseExact或DateTime.TryParseExact.

If it is a string, then you need to Parse the string, and hope like heck that the string format is the same as your local system! :laugh: If it is a specific string format, then DateTime.ParseExact or DateTime.TryParseExact will be the way to go.

DateTime val;
if (DateTime.TryParse(dss.Tables["ITdata"].Rows[0]["pudate"].ToString(), out val))
{
    dateTimePicker1.Value = val;
}
else
{
    /**
    assign some fallback value to dateTimePicker1.Value, or raise an exception, or
    do whatever needs to be done.
    **/
}

dateTimePicker1.Value = Convert.ToDateTime(dss.Tables["ITdata"].Rows[0]["pudate"].ToString());

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