How to Read Data from an Excel File Using C#?

Read Excel file data using C#

Question:

How to read Excel file data using C#? I've tried opening the file and copying it to the clipboard but not sure how to proceed.

Answer:

Using C# to read Excel file data, you can consider the following methods:

1. Create Excel object:

<code class="language-csharp">Excel.ApplicationClass ExcelObj = new Excel.ApplicationClass();
ExcelObj.Visible = false;</code>

2. Open workbook and worksheet:

<code class="language-csharp">Excel.Workbook theWorkbook = ExcelObj.Workbooks.Open(s.Text, 0, true, 5, "", "", true, Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, false, false);
Excel.Worksheet worksheet = (Excel.Worksheet)theWorkbook.Worksheets.get_Item(count);</code>

3. Access cells as named ranges:

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

4. Get cell value:

<code class="language-csharp">range.Text // 返回用户可见文本
range.Value2 // 返回Excel中存储的实际值</code>

5. Iterate cells:

<code class="language-csharp">Excel.Range range1 = sheet.get_Range("A1:A5", Missing.Value);
if (range1 != null)
{
    foreach (Excel.Range r in range1)
    {
        string user = r.Text;
        string value = r.Value2;
    }
}</code>

Clean up:

Remember to close and release Excel objects in the reverse order of creation so they are disposed of correctly.

Example:

<code class="language-csharp">using System;
using ExcelTools = Ms.Office;
using Excel = Microsoft.Office.Interop.Excel;

public class ExcelReader
{
    public static void ReadWorkbook(string fileName)
    {
        Excel.Application excel = null;
        Excel.Workbook wkb = null;

        try
        {
            excel = new Excel.Application();
            wkb = ExcelTools.OfficeUtil.OpenBook(excel, fileName);

            Excel.Worksheet sheet = wkb.Sheets["Data"] as Excel.Worksheet;
            Excel.Range range = sheet.get_Range("A1", Missing.Value);

            string A1 = String.Empty;
            if (range != null)
                A1 = range.Text.ToString();

            Console.WriteLine("A1单元格的值: {0}", A1);
        }
        catch (Exception ex)
        {
            // 在此处处理错误
        }
        finally
        {
            ExcelTools.OfficeUtil.ReleaseRCM(wkb);
            ExcelTools.OfficeUtil.ReleaseRCM(excel);
        }
    }
}</code>

Additional notes:

• Set visibility to false to prevent Excel from showing.
• Consider using the OleDb provider as an alternative method of accessing Excel data.
• To find a specific value, use Excel.Cells.Find.

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