The following sample shows how to retrieve a list of contacts where the FamilyStatusCode is 3. This corresponds to the Marital Status choice of Divorced. The following sample shows how to retrieve a list of contacts with an Anniversary date later than February 5, The following sample shows how to retrieve contacts ordered by LastName in descending order and FirstName in ascending order.
The following sample shows how to retrieve only the first contact row returned and retrieve only one contact row that matches the criterion. The following sample shows how to retrieve the label for a choices option, in this case the value for the current row. The FirstOrDefault operator returns the first element of a sequence, or a default value if no element is found.
The SingleOrDefault operator returns a single, specific element of a sequence, or a default value if that element is not found. The following sample shows how to use these operators. The following sample shows how to retrieve the names of two accounts where one account is the parent account of the other. The following sample shows how to retrieve a specific contact where the anniversary date is later than January 1, The following sample shows a paging sort where the column being sorted is different from the column being retrieved.
It support method syntax in both C and VB. It present in both the Queryable and Enumerable class. It will throw ArgumentNullException if the given source is null. It does not return value instead of this it return true or false. The return type of this operator is System. Example Output: Is the given sequence contain element as 10 : True Is the given sequence contain element as 'oo' : True Is the given sequence contain element as 'c' : True.
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In general, the rule is to use 1 whenever possible, and use 2 and 3 whenever necessary. The recommended way to write most queries is to use query syntax to create query expressions. The following example shows three query expressions. The first query expression demonstrates how to filter or restrict results by applying conditions with a where clause.
It returns all elements in the source sequence whose values are greater than 7 or less than 3. The second expression demonstrates how to order the returned results. The third expression demonstrates how to group results according to a key. This query returns two groups based on the first letter of the word. All of these queries could be written using var as shown in the following example:. In each previous example, the queries do not actually execute until you iterate over the query variable in a foreach statement or other statement.
Some query operations must be expressed as a method call. The most common such methods are those that return singleton numeric values, such as Sum , Max , Min , Average , and so on. These methods must always be called last in any query because they represent only a single value and cannot serve as the source for an additional query operation. The following example shows a method call in a query expression:. If the method has Action or Func parameters, these are provided in the form of a lambda expression, as shown in the following example:.
In the previous queries, only Query 4 executes immediately. The method itself has to use foreach in order to compute its value. There are four operators for the set operations, each yielding a result based on different criteria. Except the DefaultIfEmpty, all the rest eight standard query element operators return a single element from a collection.
Previous Page. Next Page. Previous Page Print Page. Dashboard Logout. The operator project the sequences of values which are based on a transform function as well as flattens them into a single sequence. Filters values on basis of their , depending on their capability to be cast to a particular type. Determines by searching a sequence that whether any element of the same satisfy a specified condition. Same as that of Skip with the only exception that number of elements to skip are specified by a Boolean condition.
Same as that of Take except the fact that number of elements to take are specified by a Boolean condition. Compares the values of two collections and return the ones from one collection who are not in the other collection. Combines content of two different collections into a single list that too without any duplicate content.
Same as ElementAt except of the fact that it also returns a default value in case the specific index is out of range. Retrieves the first element within a collection or the first element satisfying a specific condition.