You might need to add ausingdirective,using System.Linq;, for the preceding example to compile. The most recent versions of .NET make use ofimplicit usingsto add this directive as aglobal using. Older versions require you to add it in your source. ...
Northwnd db =newNorthwnd(@"c:\northwnd.mdf");// Query for customers in London.IQueryable<Customer> custQuery =fromcustindb.Customerswherecust.City =="London"selectcust; For more information about how to create specific types of data sources, see the documentation for the various LINQ providers...
You might need to add ausingdirective,using System.Linq;, for the preceding example to compile. The most recent versions of .NET make use ofimplicit usingsto add this directive as aglobal using. Older versions require you to add it in your source. ...
If the method hasSystem.ActionorSystem.Func<TResult>parameters, these arguments are provided in the form of alambda expression, as shown in the following example: C# // Query #6.IEnumerable<int> largeNumbersQuery = numbers2.Where(c => c >15); ...
If the method hasSystem.ActionorSystem.Func<TResult>parameters, these arguments are provided in the form of alambda expression, as shown in the following example: C# // Query #6.IEnumerable<int> largeNumbersQuery = numbers2.Where(c => c >15); ...
This example shows how to perform aggregate computations using LINQ in C#, such as Sum, Average, Min, and Max, on the columns of a .csv file.
In the previous example we assign an entire Category object to our product, but what if we want all the fields in our Product class, but we don't want to specify every field by hand? Unfortunately, we cannot write this:from p in db.Product from c in db.Category.Where(q => q....
reegeek/StructLinq StructLinq Implementation in C# of LINQ concept with struct to reduce drastically memory allocation and improve performance. IntroduceIRefStructEnumerableto improve performance when element are fat struct. Installation This library is distributed viaNuGet. To installStructLinq:...
LINQ实现IN操作 string[] ids =newstring[]{10101,10005,10007}; db.Profile.WhereNotIn(c => c.Id,ids);
LINQ实现IN操作 string[] ids =newstring[]{10101,10005,10007}; db.Profile.WhereNotIn(c => c.Id,ids);