asp.netC#數據導出Excel實例介紹

2019-11-14 16:50:13

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Excel導出在C#代碼中應用己經很廣泛了，我這里就做些總結，供自己和讀者學習用。

Excel知識點。
一、添加引用和命名空間

添加Microsoft.Office.Interop.Excel引用，它的默認路徑是C:PRogram FilesMicrosoft Visual
Studio 9.0Visual Studio Tools for
OfficePIAOffice12Microsoft.Office.Interop.Excel.dll
代碼中添加引用using
Microsoft.Office.Interop.Excel;
二、Excel類的簡單介紹
此命名空間下關于Excel類的結構分別為：

applicationClass - 就是我們的excel應用程序。
Workbook -
就是我們平常見的一個個excel文件，經常是使用Workbooks類對其進行操作。
Worksheet - 就是excel文件中的一個個sheet頁。

Worksheet.Cells[row, column] -
就是某行某列的單元格，注意這里的下標row和column都是從1開始的，跟我平常用的數組或集合的下標有所不同。

知道了上述基本知識后，利用此類來操作excel就清晰了很多。
三、Excel的操作

任何操作Excel的動作首先肯定是用excel應用程序，首先要new一個ApplicationClass 實例，并在最后將此實例釋放。

ApplicationClass xlsApp = new ApplicationClass(); // 1. 創建Excel應用程序對象的一個實例，相當于我們從開始菜單打開Excel應用程序。
if (xlsApp == null)
{
//對此實例進行驗證，如果為null則表示運行此代碼的機器可能未安裝Excel
}1. 打開現有的Excel文件

代碼如下	復制代碼
Workbook workbook = xlsApp.Workbooks.Open(excelFilePath, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing); Worksheet mySheet = workbook.Sheets[1] as Worksheet; //第一個sheet頁 mySheet.Name = "testsheet"; //這里修改sheet名稱2.復制sheet頁

mySheet.Copy(Type.Missing, workbook.Sheets[1]); //復制mySheet成一個新的sheet頁，復制完后的名稱是mySheet頁名稱后加一個(2)，這里就是testsheet(2)，復制完后，Worksheet的數量增加一個注意
這里Copy方法的兩個參數，指是的復制出來新的sheet頁是在指定sheet頁的前面還是后面，上面的例子就是指復制的sheet頁在第一個sheet頁的后面。

3.刪除sheet頁

代碼如下

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xlsApp.DisplayAlerts = false; //如果想刪除某個sheet頁，首先要將此項設為fasle。
(xlsApp.ActiveWorkbook.Sheets[1] as Worksheet).Delete();4.選中sheet頁

(xlsApp.ActiveWorkbook.Sheets[1] as Worksheet).Select(Type.Missing); //選中某個sheet頁5.另存excel文件

workbook.Saved = true;
workbook.SaveCopyAs(filepath);6.釋放excel資源

workbook.Close(true, Type.Missing, Type.Missing);
workbook = null;
xlsApp.Quit();
xlsApp = null;一般的我們傳入一個DataTable生成Excel代碼

/// <summary>
///
/// </summary>
/// <param name="dt"></param>
protected void ExportExcel(DataTable dt)
{
if (dt == null||dt.Rows.Count==0) return;
Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();

如果要在excel中插入圖片，我們需要把代碼加入一行即可，如下所示

代碼如下

復制代碼

protected void ExportExcel(DataTable dt)
{
if (dt == null || dt.Rows.Count == 0) return;
Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();

    if (xlApp == null)
    {
        return;
    }
    System.Globalization.CultureInfo CurrentCI = System.Threading.Thread.CurrentThread.CurrentCulture;
    System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");
    Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
    Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
    Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];
    Microsoft.Office.Interop.Excel.Range range;
    long totalCount = dt.Rows.Count;
    long rowRead = 0;
    float percent = 0;
    for (int i = 0; i < dt.Columns.Count; i++)
    {
        worksheet.Cells[1, i + 1] = dt.Columns[i].ColumnName;
        range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, i + 1];
        range.Interior.ColorIndex = 15;
    }
    for (int r = 0; r < dt.Rows.Count; r++)
    {
        for (int i = 0; i < dt.Columns.Count; i++)
        {
            try
            {
                worksheet.Cells[r + 2, i + 1] = dt.Rows[r][i].ToString();
            }
            catch
            {
                worksheet.Cells[r + 2, i + 1] = dt.Rows[r][i].ToString().Replace("=", "");
            }
        }
        rowRead++;
        percent = ((float)(100 * rowRead)) / totalCount;
    }

    worksheet.Shapes.AddPicture("C:/Users/spring/Desktop/1.gif", Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoCTrue, 100, 200, 200, 300);
    worksheet.Shapes.AddTextEffect(Microsoft.Office.Core.MsoPresetTextEffect.msoTextEffect1, "123456", "Red", 15, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoTrue, 150, 200);
    xlApp.Visible = true;
}我們調用如下:

public void GenerateExcel()
{
    DataTable dt = new DataTable();
    dt.Columns.Add("Name", typeof(string));
    dt.Columns.Add("Age", typeof(string));
    DataRow dr = dt.NewRow();
    dr["Name"] = "spring";
    dr["Age"] = "20";
    dt.Rows.Add(dr);
    dt.AcceptChanges();
    ExportExcel(dt);
}

運行結果如下所示:

其中如下代碼的作用是

代碼如下

復制代碼

worksheet.Shapes.AddPicture("C:/Users/spring/Desktop/1.gif", Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoCTrue, 100, 200, 200, 300);在Excel的指定位置加入圖片

worksheet.Shapes.AddTextEffect(Microsoft.Office.Core.MsoPresetTextEffect.msoTextEffect1, "123456", "Red", 15, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoTrue, 150, 200);

在Excel的指定位置加入文本框，和里面的內容.

我們可以這樣來設計一個ExcelBase的基類:

先創建一個ExcelBE.cs：

代碼如下

復制代碼

public class ExcelBE
{
     private int _row = 0;
     private int _col = 0;
     private string _text = string.Empty;
     private string _startCell = string.Empty;
     private string _endCell = string.Empty;
     private string _interiorColor = string.Empty;
     private bool _isMerge = false;
     private int _size = 0;
     private string _fontColor = string.Empty;
     private string _format = string.Empty;

     public ExcelBE(int row, int col, string text, string startCell, string endCell, string interiorColor, bool isMerge, int size, string fontColor, string format)
     {
         _row = row;
         _col = col;
         _text = text;
         _startCell = startCell;
         _endCell = endCell;
         _interiorColor = interiorColor;
         _isMerge = isMerge;
         _size = size;
         _fontColor = fontColor;
         _format = format;
     }

public ExcelBE()
{ }

     public int Row
     {
         get { return _row; }
         set { _row = value; }
     }

     public int Col
     {
         get { return _col; }
         set { _col = value; }
     }

     public string Text
     {
         get { return _text; }
         set { _text = value; }
     }

     public string StartCell
     {
         get { return _startCell; }
         set { _startCell = value; }
     }

     public string EndCell
     {
         get { return _endCell; }
         set { _endCell = value; }
     }

     public string InteriorColor
     {
         get { return _interiorColor; }
         set { _interiorColor = value; }
     }

     public bool IsMerge
     {
         get { return _isMerge; }
         set { _isMerge = value; }
     }

     public int Size
     {
         get { return _size; }
         set { _size = value; }
     }

     public string FontColor
     {
         get { return _fontColor; }
         set { _fontColor = value; }
     }

     public string Formart
     {
         get { return _format; }
         set { _format = value; }
     }

}

接下來創建ExcelBase.cs:

代碼如下

復制代碼

public class ExcelBase
{ www.111cn.net
    private Microsoft.Office.Interop.Excel.Application app = null;
    private Microsoft.Office.Interop.Excel.Workbook workbook = null;
    private Microsoft.Office.Interop.Excel.Worksheet worksheet = null;
    private Microsoft.Office.Interop.Excel.Range workSheet_range = null;

    public ExcelBase()
    {
        createDoc();
    }

    public void createDoc()
    {
        try
        {
            app = new Microsoft.Office.Interop.Excel.Application();
            app.Visible = true;
            workbook = app.Workbooks.Add(1);
            worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Sheets[1];
        }
        catch (Exception e)
        {
            Console.Write("Error");
        }
        finally
        {
        }
    }

    public void InsertData(ExcelBE be)
    {
        worksheet.Cells[be.Row, be.Col] = be.Text;
        workSheet_range = worksheet.get_Range(be.StartCell, be.EndCell);
        workSheet_range.MergeCells = be.IsMerge;
        workSheet_range.Interior.Color = GetColorValue(be.InteriorColor);
        workSheet_range.Borders.Color = System.Drawing.Color.Black.ToArgb();
        workSheet_range.ColumnWidth = be.Size;
        workSheet_range.Font.Color = string.IsNullOrEmpty(be.FontColor) ? System.Drawing.Color.White.ToArgb() : System.Drawing.Color.Black.ToArgb();
        workSheet_range.NumberFormat = be.Formart;
    }

    private int GetColorValue(string interiorColor)
    {
        switch (interiorColor)
        {
            case "YELLOW":
                return System.Drawing.Color.Yellow.ToArgb();
            case "GRAY":
                return System.Drawing.Color.Gray.ToArgb();
            case "GAINSBORO":
                return System.Drawing.Color.Gainsboro.ToArgb();
            case "Turquoise":
                return System.Drawing.Color.Turquoise.ToArgb();
            case "PeachPuff":
                return System.Drawing.Color.PeachPuff.ToArgb();

            default:
                return System.Drawing.Color.White.ToArgb();
        }
    }
}

調用的代碼如下:

代碼如下

復制代碼

private void btnRun_Click(object sender, EventArgs e)
{
    ExcelBase excel = new ExcelBase();
    //creates the main header
    ExcelBE be = null;
    be = new ExcelBE (5, 2, "Total of Products", "B5", "D5", "YELLOW", true, 10, "n",null);
    excel.InsertData(be);
    //creates subheaders
    be = new ExcelBE (6, 2, "Sold Product", "B6", "B6", "GRAY", true, 10, "",null);
    excel.InsertData(be);
    be=new ExcelBE(6, 3, "", "C6", "C6", "GRAY", true, 10, "",null);
    excel.InsertData(be);
    be=new ExcelBE (6, 4, "Initial Total", "D6", "D6", "GRAY", true, 10, "",null);
    excel.InsertData(be);
    //add Data to cells
    be=new ExcelBE (7, 2, "114287", "B7", "B7",null,false,10,"", "#,##0");
    excel.InsertData(be);
    be=new ExcelBE (7, 3, "", "C7", "C7", null,false,10,"",null);
    excel.InsertData(be);
    be = new ExcelBE(7, 4, "129121", "D7", "D7", null, false, 10, "", "#,##0");
    excel.InsertData(be);
    //add percentage row
    be = new ExcelBE(8, 2, "", "B8", "B8", null, false, 10, "", "");
    excel.InsertData(be);
    be = new ExcelBE(8, 3, "=B7/D7", "C8", "C8", null, false, 10, "", "0.0%");
    excel.InsertData(be);
    be = new ExcelBE(8, 4, "", "D8", "D8", null, false, 10, "", "");
    excel.InsertData(be);
    //add empty divider
    be = new ExcelBE(9, 2, "", "B9", "D9", "GAINSBORO", true, 10, "",null);
    excel.InsertData(be);