ObjectQuery<T>.Where(String, ObjectParameter[]) Method
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Limits the query to results that match specified filtering criteria.
public:
System::Data::Objects::ObjectQuery<T> ^ Where(System::String ^ predicate, ... cli::array <System::Data::Objects::ObjectParameter ^> ^ parameters);
public System.Data.Objects.ObjectQuery<T> Where (string predicate, params System.Data.Objects.ObjectParameter[] parameters);
member this.Where : string * System.Data.Objects.ObjectParameter[] -> System.Data.Objects.ObjectQuery<'T>
Public Function Where (predicate As String, ParamArray parameters As ObjectParameter()) As ObjectQuery(Of T)
- predicate
- String
The filter predicate.
- parameters
- ObjectParameter[]
Zero or more parameters that are used in this method.
A new ObjectQuery<T> instance that is equivalent to the original instance with WHERE applied.
The predicate
is an empty string.
This example creates a new ObjectQuery<T> that contains results of the existing query filtered by the following criteria: "it.ProductID = 900"
.
int productID = 900;
using (AdventureWorksEntities context =
new AdventureWorksEntities())
{
string queryString =
@"SELECT VALUE product FROM
AdventureWorksEntities.Products AS product";
ObjectQuery<Product> productQuery1 =
new ObjectQuery<Product>(queryString,
context, MergeOption.NoTracking);
ObjectQuery<Product> productQuery2 =
productQuery1.Where("it.ProductID = @productID");
productQuery2.Parameters.Add(new ObjectParameter("productID", productID));
// Iterate through the collection of Product items.
foreach (Product result in productQuery2)
{
Console.WriteLine("Product Name: {0}; Product ID: {1}",
result.Name, result.ProductID);
}
}
Produkt | Versjoner |
---|---|
.NET Framework | 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
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