如何在将datetime对象存储到数据表中时保留DateTime Kind？

Question

我遇到了将DateTime对象存储到数据表中的问题,它丢失了设置到它的Kind信息.例如,如果DateTime.Kind是UTC,一旦我将它分配给datarow值,它就会将Kind更改为Unspecified.Please找到下面的代码.

public class LocalTimeToUtcConverter
    {
        public DateTime Convert(DateTime localDate)
        {
            var utcOffset = TimeZoneInfo.Local.GetUtcOffset(localDate);

            var utc = localDate.ToUniversalTime();

            return utc + utcOffset;
        }
    }

 [Test]
        public void Should_set_datetime_column_kind_to_utc()
        {            
            var localDate = new DateTime(2010, 11, 01, 00, 00, 00);
            Assert.That(localDate.Kind == DateTimeKind.Unspecified);
            var converter = new LocalTimeToUtcConverter();
            DateTime date = converter.Convert(localDate);
            Assert.That(localDate.Kind == DateTimeKind.Utc);
            var data = CreateTable(date);
            //Failes-Why????
            Assert.That(((DateTime)data.Rows[0].ItemArray[0]).Kind ==   DateTimeKind.Utc);
        }

        private DataTable CreateTable(DateTime date)
        {            
            DataTable table = new DataTable();            
            table.Columns.Add(new DataColumn("Date1", typeof(DateTime)));

            for (int i = 0; i < 10; i++)
            {
                var newRow = table.NewRow();
                newRow[0] = date;
                table.Rows.Add(newRow);
            }

            return table;
        }

请你告诉我一个解决方法吗？

谢谢!!!

Answer 1

table.Columns.Add(new DataColumn("Date1",typeof(DateTime)));

使用DataColumn.DateTimeMode属性:

var col = new DataColumn("Date1", typeof(DateTime));
col.DateTimeMode = DataSetDateTime.Utc;
table.Columns.Add(col);

如果您将数据库中的日期存储在UTC中,则无关紧要.