How to Retrieve Distinct Data from a DataTable into a String Array in .NET?

Retrieving Distinct Data from a DataTable into an Array

A DataTable commonly contains duplicate values, making it necessary to extract only unique items. In such scenarios, isolating distinct rows becomes crucial. This article explores how to achieve this task using a .NET DataTable and store the results in an array.

To identify unique values in a DataTable, you can leverage the DataView class. DataView provides a means to filter and manipulate DataTable data. By creating a DataView object and specifying the distinct column as the grouping key, you can generate a DataTable containing only distinct rows.

The following code snippet demonstrates the process:

DataView view = new DataView(table);
DataTable distinctValues = view.ToTable(true, "ProcessName");

This code creates a DataView named view from the provided DataTable named table. It then applies a filter to group the rows based on the "ProcessName" column and creates the distinctValues DataTable, which contains only the distinct ProcessName values.

To store these distinct values in an array, iterate through the distinctValues DataTable and extract the values as shown below:

string[] distinctProcessNames = new string[distinctValues.Rows.Count];

for (int i = 0; i < distinctValues.Rows.Count; i++)
{
    distinctProcessNames[i] = distinctValues.Rows[i]["ProcessName"].ToString();
}

This code creates an array named distinctProcessNames and populates it with the unique ProcessName values. You can then use the distinctProcessNames array to access the distinct values as needed.

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