小编shk*_*per的帖子

我有一种情况,当我不能更新数据库中的原始记录,而是创建一个新记录,从旧复制所有字段并将更改应用于新的.(如果翻译成代码,这样的东西)

var original = from _orig in context.Test where _orig.id == 5 select _orig;
Test newTest = new Test();
newTest = original;
newTest.id = 0;
context.Test.InsertOnSubmit(newTest);
context.SubmitChanges();
original.parent_id = newTest.id;
original.isActive = 0;

这给出了以下例外:

Cannot add an entity that already exists.

是否可以在不手动复制每个字段的情况下使其工作？

我在使用EF和AutoMapper时遇到了一些问题.= /

例如 :

我有2个相关实体(客户和订单),他们是DTO课程:

class CustomerDTO
{
   public string CustomerID {get;set;}
   public string CustomerName {get;set;}
   public IList< OrderDTO > Orders {get;set;}
}


class OrderDTO
{
   public string OrderID {get;set;}
   public string OrderDetails {get;set;}
   public CustomerDTO Customers {get;set;}
}

//when mapping Entity to DTO the code works
Customers cust = getCustomer(id);
Mapper.CreateMap< Customers, CustomerDTO >();
Mapper.CreateMap< Orders, OrderDTO >();
CustomerDTO custDTO = Mapper.Map(cust);

//but when i try to map back from DTO to Entity it fails with AutoMapperMappingException.
Mapper.Reset();
Mapper.CreateMap< CustomerDTO …

是否可以使用带有SignedXml的http://www.w3.org/2006/12/xml-c14n11 CanonicalizationMethod？

SignedXml signedXml = new SignedXml(xmlDoc);
signedXml.SignedInfo.CanonicalizationMethod = "http://www.w3.org/2006/12/xml-c14n11";

扔了

System.Security.Cryptography.CryptographicException: Could not create the XML tr
ansformation identified by the URI http://www.w3.org/2006/12/xml-c14n11.

谢谢!

是否可以共享 Google 驱动器“应用程序数据”目录中的文件夹？

我在 SO 上看到了很多类似的问题，但没有一个答案。

当用户开始在最后一行输入时,我正在尝试在表的末尾添加一个新行.viewmodel看起来像这样:

function tableRow(number, ownerViewModel) {  
    this.number = ko.observable(number);
    this.remove = function () { ownerViewModel.tableRows.destroy(this); }

    ko.dependentObservable(function () {
        var curval = this.number();
        var rows = ownerViewModel.tableRows();
        if (rows.length > 0) {
            if (curval != '' && this == rows[rows.length - 1]) {
                ownerViewModel.addNewRow();
            }
        }
    }, this);
}

function tableRowsViewModel() {
    var that = this;
    this.tableRows = ko.observableArray([]);
    this.addNewRow = function () {
        this.tableRows.push(new tableRow('', that));
    }
    this.addNewRow();
}

$(document).ready(function () {
    ko.applyBindings(new tableRowsViewModel());
});

这是html:

<table>
    <thead>
        <tr>
            <th> …

你好。我有一个看起来像这样的列表：

public class PagedList<T> : List<T>
{
    public PagedList(IEnumerable<T> collection) : base(collection)
    { }
    public int TotalItems { get; set; }
    public int CurrentPage { get; set; }
    public int PageSize { get; set; }
    //some other properties
}

并在存储库中用于分页

 public PagedList<TEntity> GetPaged(int page)
 {
   var pagedEntities = some_query;
   return pagedEntities.AsPagedList(totalResults, page, pageSize);
 }

在ASP MVC视图模型中也使用相同的PagedList进行分页。是否可以使用具有所有属性TotalItems / CurrentPage / ...的Automapper映射此集合？

   PagedList<DbItem> dbItems = _repository.GetPages(page);
   var viewItems = new PagedList<SomeItemView>();
   Mapper.Map(dbItems , viewItems);

谢谢！

在lodash中最简单的解决方案是通过例如'text'字段以值'Item-1-5-2'递归查找数组中的项目？

const data = [
      {
        id: 1,
        text: 'Item-1',
        children: [
          { id: 11, text: 'Item-1-1' },
          { id: 12, text: 'Item-1-2' },
          { id: 13, text: 'Item-1-3' },
          { id: 14, text: 'Item-1-4' },
          {
            id: 15,
            text: 'Item-1-5',
            children: [
              { id: 151, text: 'Item-1-5-1' },
              { id: 152, text: 'Item-1-5-2' },
              { id: 153, text: 'Item-1-5-3' },
            ]
          },
        ]
      },
      {
        id: 2,
        text: 'Item-2',
        children: [
          { id: 21, text: 'Item-2-1' },
          { id: …

我正在尝试在T-SQL中执行计算,但我遇到了一些问题.这是我正在尝试做的事情:

DECLARE @CNT money
SELECT @CNT = 0

Select Amount,
        case
            when Service like 'pay_in' then SET @CNT = @CNT + Amount
            when Service like 'pay_out' then SET @CNT= @CNT - Amount
        end
   from Payment where isActive = 1

select @CNT

由于我对T-SQL语法知之甚少,我被困在这里,如果有人能够把我推向正确的方向,我将非常感激.谢谢!

将.net类序列化为json并在javascript中使用它的正确方法是什么？

例如在服务器端,我们有这个:

    public ActionResult Index()
    {
        var someClass = new SomeClass { Message = "let's try <b> this </b> and this \" " };
        ViewBag.someDataJson = JsonConvert.SerializeObject(someClass);
        return View();
    }

    public class SomeClass
    {
        public string Message;
    }

在客户端:

<script type="text/javascript">
    $(document).ready(function() {
        var someData = $.parseJSON("@Html.Raw(ViewBag.someDataJson)");
        alert(someData.Message);
    });
</script>

将导致:

var someData = $.parseJSON("{"Message":"let's try <b> this </b> and this \" "}");

哪个不对.也没有Html.Raw()结果也将是不正确的:

var someData = $.parseJSON("{"Message":"let's try <b> this </b> and this \" "}");

谢谢!