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How do you select distinct by one column in LINQ?

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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.

What is distinct in LINQ C#?

C# Linq Distinct() method removes the duplicate elements from a sequence (list) and returns the distinct elements from a single data source. It comes under the Set operators’ category in LINQ query operators, and the method works the same way as the DISTINCT directive in Structured Query Language (SQL).

How do you use DistinctBy in Linq?

DistinctBy(IEnumerable, Func, IEqualityComparer) Returns distinct elements from a sequence according to a specified key selector function and using a specified comparer to compare keys.

How does distinct work in C#?

The Distinct() method works the same way as the DISTINCT directive in SQL. It returns a new sequence containing all the elements from the target sequence that are distinct from each other, as determined by the default equality comparer for the data type of the sequence.

How do I get distinct values in lambda expression?

var distinctValues = myCustomerList. Distinct(someEqualityComparer); The equality comparer argument must be an instance of IEqualityComparer .

How to select distinct with LINQ when comparing values?

LINQ Distinct by Field. If you want to achieve the distinct values for a specific field in the list, you can use the following two methods: 1. Using GroupBy and Select functions. In this approach, you need to use two LINQ functions i.e. GroupBy and Select to achieve the list of unique field values. The following code is an example of this

How to convert dataset to list in C# using LINQ?

Using a Loop.

  • Using LINQ.
  • Using a Generic Method.

    • How to do sum of a column with LINQ?

    LINQ Sum – gets sum of numeric collection

  • LINQ Max – gets maximal item from collection
  • LINQ Min – gets minimal item from collection
  • LINQ Count – counts number of items in a collection (result type is Int32)
  • LINQ LongCount – counts number of items in a collection (result type is Int64)
  • LINQ Average – computes average value of numeric collection

    • What is LINQ and array processing using LINQ?

    LINQ query can be execute in multiple ways, here we used foreach loop to execute our query stored in myLinqQuery. The foreach loop executes the query on the data source and get the result and then iterates over the result set. Thus, every LINQ query must query to some kind of data sources whether it can be array, collections, XML or other

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