How to Extract and Store Unique Values from a DataTable Column into an Array?

Retrieving and Storing Distinct Values from a DataTable into an Array

In data processing scenarios, it is often necessary to eliminate duplicate values from a dataset and retrieve only the unique occurrences. In the context of a DataTable, this process is essential for obtaining accurate and concise results. Consider a scenario where you have a DataTable named Table1 within a dataset objds, containing a column called ProcessName with replicated entries. To isolate and store the distinct ProcessName values into an array, follow these steps:

To begin, create a DataView instance based on the DataTable:

DataView view = new DataView(table);

Next, utilize the DataView's ToTable method to generate a new DataTable containing only the distinct values in the specified columns. In this case, assuming you want to extract distinct values from the ProcessName column, the code would be:

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

Now, you can iterate through the distinctValues DataTable and populate an array with the unique ProcessName values:

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

By following these steps, you can effectively isolate and store distinct values from a DataTable into an array, ensuring data accuracy and streamlining your data processing operations.

The above is the detailed content of How to Extract and Store Unique Values from a DataTable Column into an Array?. For more information, please follow other related articles on the PHP Chinese website!