下面的代码给出以下错误:
"表达式树可能不包含动态操作"
var x = db.Data.Select(x => new { name = TitleHT[x.TitleId], x.TitleId }).GroupBy(x => x.name);
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TitleHT是Dictionary<int, string>我可以查找TitleId的字符串表示.因此,我试图在查询中为此字符串文字指定名称.TitleId的类型是int?不确定这是否重要.
//This code will print the as per the request.
Response.Write("<<<<<<<=======>>>>>>>>>>");
//In this case its not writing as per the request.
Response.Write("<<<<<<<hello======>>>>>>>>>>");
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在这种情况下,它只打印<<<<<< >>>>>>>>>.表示删除所有文本,关联所有=符号.
这是什么问题?我只是写文字.但没有得到.
谁知道这个......帮助我?
datetime=Datetime.Now;
string strquery = @"INSERT INT0 [Destination_CMS].[dbo].[Destination_CMS_User]
values('" + userid + "','" + email + "','"
+ userType + "','" + userStatus + "','" + processed + "','"
+ datetime.ToLongDateString() + "')";
cmd = new SqlCommand(strquery, con);
con.Open();
cmd.ExecuteNonQuery();
con.Close();
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我收到错误:'Destination_CMS'附近的语法不正确.
我有两个列表
ListA ={'a','b','c','d','e'};
ListB ={'a','c','d','f'}
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我需要ListC来自ListA和ListB,等等ListC= {'b','e'}
这可能ListC吗?如何实现?
String.Format("args.{0} = '{1}'", dynaform.RequiredModelName, dynaform.RequiredModel)
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预期结果:
args.myVariable = 'someOtherStuff'
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实际结果:
args.myVariable = 'someOtherStuff'
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第二次尝试:
Html.Raw(String.Format("args.{0} = '{1}'", dynaform.RequiredModelName, dynaform.RequiredModel))
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结果:
你调用的对象是空的.
我怎么能告诉String.Format输出'作为'和不作为'?这是很无奈,而且由于现在,我必须避免的String.Format与交易时'或"
如何反序列化以下内容.问题是变量名是一个数字.那么应该如何定义MyClass呢?
json_str:
{"23521952": {"b": [], "o": []}, "23521953": {"b": [], "o": []}}
class MyClass { //? };
var var = JsonConvert.DeserializeObject<MyClass>(json_str);
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{
if (field.TableColumn.ToLower() == "esig"&& field.Data != null && !string.IsNullOrEmpty(field.Data.ToString()) && field.Data.ToString() != "N")
{
EsigBase64Value = field.Data.ToString();
field.Data = "Y";
}
}
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这是我正在使用的每个循环,我想将每个循环的这个转换为 lambda 表达式,请帮助我
I love my Delphi 4 but at the same time I see the need to talk to windows .net This is a recompiled dll that I found on sourceforge.net/projects/delphinet/ (DelphiNet03.zip) by some nice people that fund the dll from some were. The real answer is to make this dll so that fits into Delphi as true Delphi code, and not a dll clip on. So we can make objects that use dot net in Delphi. Because I’m not an assembly …
假设我有一个字符串,其文本类似于"mohdibrahim.tasal".我想"mohdibrahim"从这个字符串中提取.
我试过这段代码:
string updateUser1 = user1.Trim();
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这是正确的方法,还是我应该使用另一种技术?
有没有办法在C#中声明一个通用的静态方法?
例如:
public static class Class<T,P>
where T:class
where P:class
{
public static T FromTtoP (this P ob)
{
...
}
}
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这段代码不起作用.我想从DTO映射到DAL,反之亦然.
我试过让这个类非泛型
public static class Class
{
public static TDTO MapToDTO<TDTO, TDAL>(this TDAL dal)
where TDTO : class
where TDAL : class
{
}
}
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我从"this"收到错误消息.