How Do I Read and Find Specific Data in Excel Files Using C#?

Accessing Data from Excel Files with C#

This guide details how to efficiently read and locate specific data within Excel files using C# and the Microsoft Excel Interop libraries.

The example C# code opens a workbook (specified by s.Text) and processes each worksheet. While the code activates and hides each sheet, the core data access is missing. Instead of using array-like access (e.g., Worksheet[0][0]), you should leverage Named Ranges to pinpoint specific cells or cell ranges. For instance, to access cell A1 in the first worksheet:

<code class="language-csharp">Excel.Range range = sheet.get_Range("A1", Missing.Value);</code>

The cell's content can then be retrieved using range.Text or range.Value2:

<code class="language-csharp">string user = range.Text;
string value = range.Value2;</code>

Complete data extraction requires iterating through the defined Named Ranges and extracting the relevant information. Crucially, remember to properly release and dispose of the Excel application to prevent memory leaks.

The provided code omits the alternative OleDb approach for Excel file interaction.

Locating Specific Values in Excel

To find a particular value within an Excel file, use the Find method on the worksheet's Cells collection. The following code snippet demonstrates how to locate the next instance of a specified value:

<code class="language-csharp">range = sheet.Cells.Find("Value to Find", 
                          Type.Missing, 
                          Type.Missing, 
                          Type.Missing, 
                          Type.Missing, 
                          Excel.XlSearchDirection.xlNext, 
                          Type.Missing, 
                          Type.Missing, 
                          Type.Missing);</code>

Once found, access the cell's content via range.Text or range.Value2.

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