C# Linq-to-sql 错误：“int[]”不包含“Contains”的定义
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Linq-to-sql error: 'int[]' does not contain a definition for 'Contains'
提问by Yves
I am having an error:
我有一个错误：
Error 2 'int[]' does not contain a definition for 'Contains' and the best extension method overload 'System.Linq.Enumerable.Contains(System.Collections.Generic.IEnumerable, TSource)' has some invalid arguments
错误 2 'int[]' 不包含 'Contains' 的定义，并且最好的扩展方法重载 'System.Linq.Enumerable.Contains(System.Collections.Generic.IEnumerable, TSource)' 有一些无效的参数
This is my code:
这是我的代码：
public partial class mymymy : System.Web.UI.Page
{
int[] validType = { 2, 3, 4, 5, 6, 8, 13, 14, 16, 22 };
protected void Page_Load(object sender, EventArgs e)
{
}
protected void LinqDataSource_Selecting(object sender, LinqDataSourceSelectEventArgs e)
{
using (var dc = new soxMainDataContext())
{
var qry = from item in dc.LeaveRequests
where **validType**.Contains(item.Type)
&& item.MgtApproval == null
select item;
e.Result = qry;
}
}
}
采纳答案by Jon Skeet
I strongly suspect that item.Typeisn't an int. Is it an enum? If so, try explicitly casting:
我强烈怀疑这item.Type不是int. 是枚举吗？如果是这样，请尝试显式转换：
var qry = from item in dc.LeaveRequests
where validType.Contains((int) item.Type)
&& item.MgtApproval == null
select item;
Alternatively, as dot notation:
或者，作为点符号：
var query = dc.LeaveRequests.Where(item => validType.Contains((int) item.Type)
&& item.MgtApproval == null);
回答by mqp
item.Typeisn't an int.
item.Type不是int.
回答by navi_osoro
var consulta = from pr in lsprodcts
where pr.nProductoID.ToString().Contains(Idproducto.ToString())
select new
{
pr.nProductoID,
ProdName = pr.cNombre,
pr.cDescripcion,
};
`
`
