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May I ask that what is the meaning of this assign code?

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Hi @Happydayyy,
This is the Copilot’s answer:
This is a piece of code written in VB.NET, not C#. It’s using LINQ (Language Integrated Query) to perform several operations on a DataTable (dt). Here’s a step-by-step explanation:

  1. dt.AsEnumerable(): This converts the DataTable to an EnumerableRowCollection<DataRow>, which allows LINQ operations to be performed on it.
  2. .Where(function(x) Not String.IsNullOrWhiteSpace(x(0).ToString)): This filters the rows to only include those where the first column (index 0) is not null or whitespace.
  3. .GroupBy(function(r) r("FA Number").ToString): This groups the remaining rows by the value in the “FA Number” column.
  4. .ToDictionary(function(g) g.Key, function(g) g.First()): This converts the grouped rows into a dictionary. The keys of the dictionary are the “FA Number” values, and the values are the first row in each group.

The result is a Dictionary<string, DataRow> where each key is a unique “FA Number” value and each value is the first row in the original DataTable that had that “FA Number” value.

Hope it helps you!

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Hi @Happydayyy
→ dt.AsEnumerable(): This converts the DataTable dt into an enumerable collection of DataRow objects. This allows us to use LINQ queries to manipulate the data.

→ .Where(Function(x) Not String.IsNullOrWhiteSpace(x(0).ToString)): This filters out any rows where the value in the first column (x(0)) is either null, empty, or consists only of whitespace. String.IsNullOrWhiteSpace() checks if the string is either null, empty, or contains only whitespace characters.

→ .GroupBy(Function(r) r("FA Number").ToString()): This groups the filtered DataRow objects by the value of the “FA Number” column. It creates groups where each group contains rows with the same “FA Number” value.

→ .ToDictionary(Function(g) g.Key, Function(g) g.First()): This converts the grouped data into a dictionary where:

  • The key of each dictionary entry is the value of the “FA Number” column (obtained from g.Key, where g represents each group).
  • The value of each dictionary entry is the first DataRow in the group (obtained from g.First()).

In summary, this LINQ query filters out any rows with empty or whitespace values in the first column, groups the remaining rows by the “FA Number” column, and then converts the grouped data into a dictionary where each “FA Number” is associated with the first DataRow in its respective group.

Hope you understand!!
For more information on Linq you can follow Rakesh Kumar Behara Youtube videos and @ppr linq threads.

Regards

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