小编Nii*_*ke2的帖子

我想在00:00:00将DateTime属性设置为前一天.我不知道为什么DateTime.AddDays(-1)不起作用.或者为什么DateTime.AddTicks(-1)不起作用.首先应该这样做吗？

我有2个物体.每个对象都有DateTime字段ValidFrom,ValidTo.

编辑:下班回家后,我试图获得与业务对象行为相同的行为.下面是我试图复制它看起来如何工作的代码.当然这是在家工作但不工作.好消息是我得到了很好的答案,并且+1!=)

public class RuleValue
{
    public DateTime ValidFrom, ValidTo;

    public RuleValue(DateTime _validFrom, DateTime _validTo)
    {
        ValidFrom = _validFrom;
        ValidTo = _validTo;
    }

    // oldObject.ValidFrom = 1900-01-01
    // oldObject.ValidTo = 9999-12-31

    // newObject.ValidFrom = 2010-03-22
    // newObject.ValidTo = 9999-12-31
    public void ChangeOldDate(RuleValue oldObject, RuleValue newObject)
    {
        /* 
         * 1: When first object (oldObject) have ValidTo set to SQL-server maxdate (9999-12-12 23:59:59 etc)
         *    I want to allow for a new object to be created
         * 2: oldObject timespan ValidFrom-ValidTo …

我需要在C#和Linq中将这个XML复制到XML.除了正常的.NET之外,我不希望任何依赖于其他库.XML如下所示.

问题:我无法弄清楚如何打印这两行:

<?mso-application progid="Excel.Sheet"?>
<Data ss:Type="String">name</Data>

完整的XML文档:

<?xml version="1.0" encoding="utf-8" ?>
<?mso-application progid="Excel.Sheet"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:x="urn:schemas-microsoft-com:office:excel"
  xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml"
  xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
  xmlns:o="urn:schemas-microsoft-com:office:office"
  xmlns:html="http://www.w3.org/TR/REC-html40"
  xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet">
    <OfficeDocumentSettings xmlns="urn:schemas-microsoft-com:office:office"></OfficeDocumentSettings>
    <ExcelWorkbook xmlns="urn:schemas-microsoft-com:office:excel"></ExcelWorkbook>
    <Worksheet ss:Name="Sheet 1">
        <Table>
            <Row>
                <Cell>
                    <Data ss:Type="String">name</Data>
                    </Cell>
                                <Cell>
                    <Data ss:Type="String">status</Data>
                </Cell>
                           </Row>
            <Row>
                <Cell>
                    <Data ss:Type="String">Niike2</Data>
                </Cell>
                <Cell>
                    <Data ss:Type="String">Enabled</Data>
                </Cell>
            </Row>
        </Table>
    </Worksheet>
</Workbook>

码:

XNamespace ns = "urn:schemas-microsoft-com:office:spreadsheet";
XDocument doc = new XDocument(
    new XDeclaration("1.0", "UTF-8", string.Empty),
        new XComment(String.Format("Exported: {0}", DateTime.Now)),
        new XElement(ns + "Workbook",
            new XAttribute(XNamespace.Xmlns + "xsi", …

创建对象时:

var customers = new Customers
{
    Persons = new List<Person>
    {
        new Person { CustomId = "111" },
        new Person { CustomId = "222" }
    },
    Organizations = new List<Organization>
    {
        new Organization { CustomId = "333" }
    },
    Keys = new HashSet<string> { "111", "222", "333" }
};

我想更改Keys的初始化以使用Person [0] .CustomId,Person [1] .CustomId和Organization [0] .CustomId中的先前值.(不像这样的"111","222","333"硬编码)

在这种初始化中有没有一种简单的方法可以做到这一点？我可以在客户初始化后添加密钥,如下所示:

foreach (var person in customers.Persons)
{
    customers.Keys.Add(person.CustomId);
}
foreach (var org in customers.Organizations)
{
    customers.Keys.Add(org.CustomId);
}

但我不能在与客户相同的初始化中从人员和组织属性创建密钥？