How is the datatable used in C#?

1 year ago
Sophia Anderson
2 minutes

The DataTable is a class in C# that is used to store and manipulate data in memory. It has a structure similar to a database table, with collections of rows and columns. Each row represents a data record, and each column represents a data field.

Below are some common usages of DataTable:

  1. Create a DataTable object:
  2. Create a new DataTable with the name “TableName”.
  3. Definition of table structure:
  4. Add a new column to the DataTable with the specified name and data type.
  5. Insert row data.
  6. Create a new row in the data table and assign a value to a specific column before adding the row to the data table.
  7. Accessing and modifying data:
  8. – Accessing data using row and column indexes:
    Access the data by row and column index
    var value = dt.Rows[rowIndex][columnIndex];
    dt.Rows[rowIndex][columnIndex] = newValue;

    – Accessing data using column names:
    Access the data using the column names
    var value = dt.Rows[rowIndex][“ColumnName”];
    dt.Rows[rowIndex][“ColumnName”] = newValue;

  9. Iterate through the data.
  10. For each row in the data table, loop through each column and process the data value.
  11. Filtering and sorting data:
  12. Filter the data by selecting rows where the column name is ‘Value’.

    Sort the data by selecting rows and ordering them in ascending order based on the column name.

  13. perform a search operation:
  14. Retrieve the result where the column name is equal to ‘Value’.
  15. Importing and exporting data:
  16. // Import data into a DataTable
    dt = new DataTable();
    dt.Load(reader);

    // Export data to other formats, such as XML or CSV
    dt.WriteXml(“filename.xml”);
    dt.WriteXmlSchema(“schema.xsd”);
    dt.WriteCsv(“filename.csv”);

It is important to note that DataTable is a very flexible and powerful class that offers many functions for handling and manipulating data. The above examples are just some common uses, there are many more methods and properties available for use.

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