How do I select distinct values in LINQ query?

The Distinct() function in LINQ can be applied by the properties. You can make groups and get the first object from each group or you can use DistinctBy function to achieve the result.

How do you select distinct by one column in LINQ?

Select(x => x. FirstOrDefault()); This will group the table by Text and use the first row from each groups resulting in rows where Text is distinct.

How can we get distinct values from database using LINQ?

LINQ: Read Distinct Record from Data Table

public JsonResult getEmpCity()
{
using (CompanyDBEntities dc = new CompanyDBEntities())
{
var query = (from p in dc. Emp_Information.
select p. City). ToList();
return new JsonResult.
{

What does distinct do in Linq?

LINQ Distinct operator is used for removing duplicates elements from the sequence (list). Distinct operator comes under Set operators category in LINQ query operators. For example, we have one collection A = { 1, 2, 3, 3, 4, 4, 5}.

What is distinct in C#?

The Distinct(IEnumerable) method returns an unordered sequence that contains no duplicate values. It uses the default equality comparer, Default, to compare values. In Visual Basic query expression syntax, a Distinct clause translates to an invocation of Distinct.

Why distinct is not working in Linq?

LINQ Distinct is not that smart when it comes to custom objects. All it does is look at your list and see that it has two different objects (it doesn’t care that they have the same values for the member fields). One workaround is to implement the IEquatable interface as shown here.

How do I select one column as distinct?

Adding the DISTINCT keyword to a SELECT query causes it to return only unique values for the specified column list so that duplicate rows are removed from the result set.

How can I get distinct values from Datatable using Linq in VB net?

You can use ToTable(distinct As Boolean, ParamArray columnNames As String()) method for this. This will return distinct Users for you. You can add multiple column names if you want.

Why do we use distinct in C#?

The Distinct(IEnumerable) method returns an unordered sequence that contains no duplicate values. It uses the default equality comparer, Default, to compare values. To compare a custom data type, you need to implement this interface and provide your own GetHashCode and Equals methods for the type.

What is distinct MVC?

The Distinct extension method returns a new collection of unique elements from the given collection.

How do I select distinct in Entity Framework?

Try this: var results = (from ta in context. TestAddresses select ta.Name). Distinct();

Does Linq distinct use equals?

Linq distinct doesn’t call Equals method.

What’s the difference between Func in C and Func ( )?

IIRC func (void) in C will declare a function that takes no parameters whereas func () declares a function that will take any number of parameters. I believe the latter is an artifact coming from pre-ANSI C. According to Wikipedia here, the declaration func () does basically declare the function “without information about the parameters”.

How does the func identifier work in C?

It means that C compiler implicitly adds __func__ in every function so that it can be used in that function to get the function name. To understand it better, let us write this code: And it’ll give output as foobar.

What can func be used for in C #?

C# Func. Func is a built-in generic delegate type. Others include Predicate and Action. Func can be used with a method, an anonymous method or a lambda expression. Func can contains 0 to 16 input parameters and must have one return type. (There are 16 overloads of the Func delegate.)

What do you need to know about C functions?

C – Functions. A function declaration tells the compiler about a function’s name, return type, and parameters. A function definition provides the actual body of the function. The C standard library provides numerous built-in functions that your program can call. For example, strcat() to concatenate two strings,…