当时间具有时区信息时，将XML读入Datatable会给出错误的DateTime [英] Reading XML into Datatable gives incorrect DateTime when the time has Time Zone info

问题描述

因此，我的客户端运行一些代码，将其当前时间写入xml文件，然后我想将其回读到数据表中，但是我得到的时间信息不正确.

So my client runs some code that writes their current time to an xml file which I then want to read back into a data table but I am getting incorrect time information.

例如，他们的当前时间是 09:31 ，其时区是 UTC + 1:00 .

For example their current time is 09:31 their time zone is UTC+1:00.

我的代码是:

var ds = new DataSet("MyDataSet");
var dt = ds.Tables.Add("MyDataTable");
dt.Columns.Add("MyDateTime", typeof(DateTime));

var startingDateTime = DateTime.Now;
dt.Rows.Add(startingDateTime);
String xmlDT = String.Empty;

using (MemoryStream memoryStream = new MemoryStream())
{
    dt.WriteXml(memoryStream,XmlWriteMode.WriteSchema);
    xmlDT = Encoding.UTF8.GetString(memoryStream.ToArray());
}
string myFile = @"C:\Users\me\Documents\test1.txt"
XmlDocument doc = new XmlDocument();
doc.LoadXml(xmlDT);
doc.Save(myFile);

myFile现在包含:

myFile now contains:

<NewDataSet>
  <xs:schema id="NewDataSet" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
    <xs:element name="NewDataSet" msdata:IsDataSet="true" msdata:MainDataTable="MyDataTable" msdata:UseCurrentLocale="true">
      <xs:complexType>
        <xs:choice minOccurs="0" maxOccurs="unbounded">
          <xs:element name="MyDataTable">
            <xs:complexType>
              <xs:sequence>
                <xs:element name="MyDateTime" type="xs:dateTime" minOccurs="0" />
              </xs:sequence>
            </xs:complexType>
          </xs:element>
        </xs:choice>
      </xs:complexType>
    </xs:element>
  </xs:schema>
  <MyDataTable>
    <MyDateTime>2015-02-12T09:31:37.4250365+01:00</MyDateTime>
  </MyDataTable>
</NewDataSet>

此文件然后发送到我在英国 (+ 00:00) 的服务器中，然后我使用以下命令读取文件:

This file is then sent to my server in the UK (+00:00) where I then read the file using:

DataTable datatable2 = new DataTable();
datatable2.ReadXml(myFile);

并且我的数据表现在包含1行，其日期时间为 08:30 ，但这是不正确的，我希望它存储客户时间.更改客户端或服务器代码后，我该怎么做?

and my datatable now contains 1 row that has a datetime of 08:30 but this is incorrect and I would like it to store the clients time. How would I do this with a change to either my client or server code?

推荐答案

因此您可以在客户端添加以下行:

so client side you can add the line:

dt.Columns[0].DateTimeMode = DataSetDateTime.Unspecified;

或作为更通用的方法:

public static void RemoveTimezoneForDataSet(DataSet ds)
{
    foreach (DataTable dt in ds.Tables)
    {
        foreach (DataColumn dc in dt.Columns)
        {

            if (dc.DataType == typeof(DateTime))
            {
                dc.DateTimeMode = DataSetDateTime.Unspecified;
            }
        }
    }
}

这会将XML保存为:

<NewDataSet>
  <xs:schema id="NewDataSet" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
    <xs:element name="NewDataSet" msdata:IsDataSet="true" msdata:MainDataTable="MyDataTable" msdata:UseCurrentLocale="true">
      <xs:complexType>
        <xs:choice minOccurs="0" maxOccurs="unbounded">
          <xs:element name="MyDataTable">
            <xs:complexType>
              <xs:sequence>
                <xs:element name="MyDateTime" msdata:DateTimeMode="Unspecified" type="xs:dateTime" minOccurs="0" />
              </xs:sequence>
            </xs:complexType>
          </xs:element>
        </xs:choice>
      </xs:complexType>
    </xs:element>
  </xs:schema>
  <MyDataTable>
    <MyDateTime>2015-02-12T09:13:39.8180356</MyDateTime>
  </MyDataTable>
</NewDataSet>

因此时间可以在服务器上正确序列化

So the time gets serialized correctly on the server

这篇关于当时间具有时区信息时，将XML读入Datatable会给出错误的DateTime的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！