我的班级看起来像这样,我添加了IsModified可以为空的新属性.我可以A仅使用Name和Key属性创建一个新的类型实体,但是当我尝试更新IsModifieddb中任何现有记录为null的键时,我从Entity Framework中得到此错误:
System.Data.Entity.Validation.DbEntityValidationException.
IsModifiedcontext.SaveChangesAsync()需要该字段.
型号类:
public class A
{
public long ID { get; set; }
public string Key { get; set; }
public bool? IsModified { get; set; }
public string Name { get; set; }
public A()
{
this.IsModified = false;
}
}
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SQL Server表:
CREATE TABLE [dbo].[A]
(
[ID] [bigint] IDENTITY(1,1) NOT NULL,
[Name] [nvarchar](max) NOT NULL,
[Key] [nvarchar](max) NOT NULL,
[IsModified] [bit] NULL,
)
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我正在使用Entity Framework v6和代码优先方法.[IsModified]是可空的,所以我不确定为什么仍然需要这个领域.
下面是我的KendoUI树视图,我使用模板在每个节点上显示编辑链接,但我收到此错误:"未捕获TypeError:无法读取属性'替换'未定义"
@section scripts{
<script src="~/scripts/kendo.all.min.js"></script>
<script type="text/javascript">
var territory = new kendo.data.HierarchicalDataSource({
transport: {
read: {
type:'POST',
url: rootURL + "Territory/AllTerritories",
dataType: "json"
}
},
schema: {
model: {
id: "ID",
hasChildren: "HasChildren",
children: territory
}
}
});
$("#treeview").kendoTreeView({
dataSource: territory,
dataTextField: "Name",
dataValueField: "ID",
template: kendo.template($("#treeview-template").html())
});
</script>
}
<script id="treeview-template" type="text/kendo-ui-template">
#
<a class='show-link' href='\#'><image src="/Content/images/select2.png"></a> #
</script>
<style scoped>
#territoryTree {
text-align: center;
}
#treeview .k-sprite {
background-image: url("../content/default/coloricons-sprite.png");
}
.rootfolder {
background-position: 0 0;
}
.demo-section …Run Code Online (Sandbox Code Playgroud) 以下是公司表,我需要根据companyId和.在几天内连续两个日期之间取得差异 rownum
company_id date row_num
101 2017-01-12 1
101 2017-02-22 2
118 2017-03-23 1
119 2017-04-18 1
123 2017-01-12 1
123 2017-01-15 2
123 2017-01-22 3
501 2017-01-30 1
501 2017-02-02 2
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预计OutPut:
company_id date days
101 2017-01-12 0
101 2017-02-22 41
118 2017-03-23 0
119 2017-04-18 0
123 2017-01-12 0
123 2017-01-15 3
123 2017-01-22 7
501 2017-01-30 0
501 2017-02-02 3
Run Code Online (Sandbox Code Playgroud) 我有一个会话对象,其中包含一个对象列表..
Session.Add("errorlist",errorlist);
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现在我想在另一个函数中循环遍历此错误列表.我试过,但它给出了以下错误:
foreach statement cannot operate on variables of type 'object' because 'object' does not contain a public definition for 'GetEnumerator'
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这是我试过的:
var error = Session["errorlist"];
foreach (var item in error)
{
//Something here
}
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我可以在"error"变量中看到对象列表.