C# DataGridView匯出Excel的兩種經典方法

2016年04月07日 10:10:55 貝爺_野外求生 閱讀數：4362更多

個人分類： C#

第一種是用資料流匯出:

#region
            SaveFileDialog saveFileDialog = new SaveFileDialog();
            saveFileDialog.Filter = "Execl files (*.xls)|*.xls";
            saveFileDialog.FilterIndex = 0;
            saveFileDialog.RestoreDirectory = true;
            saveFileDialog.CreatePrompt = true;
            saveFileDialog.Title = "Export Excel File";
            saveFileDialog.ShowDialog();
            if (saveFileDialog.FileName == "")
                return;
            Stream myStream;
            myStream = saveFileDialog.OpenFile();
            StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));

            string str = "";
            try
            {
                for (int i = 0; i < dataGridView1.ColumnCount; i++)
                {
                    if (i > 0)
                    {
                        str += "\t";
                    }
                    str += dataGridView1.Columns[i].HeaderText;
                }
                sw.WriteLine(str);
                for (int j = 0; j < dataGridView1.Rows.Count; j++)
                {
                    string tempStr = "";
                    for (int k = 0; k < dataGridView1.Columns.Count; k++)
                    {
                        if (k > 0)
                        {
                            tempStr += "\t";
                        }
                        tempStr += dataGridView1.Rows[j].Cells[k].Value.ToString();
                    }
                    sw.WriteLine(tempStr);
                }
                sw.Close();
                myStream.Close();
            }

            catch (Exception ex)
            {
                //MessageBox.Show(ex.ToString());
            }
            finally
            {
                sw.Close();
                myStream.Close();
            }
#endregion
 

這種方法的優點就是匯出比較快，但是excel的表格裡面設定標題，字型樣式等都不能弄，因為你是用資料流直接匯出為excel的，除非你能在資料流中設定這些樣式，這個我還沒這本事，哪位大哥會的教一下...嘿嘿

第二種方法是直接寫一個類，這個類直接操作EXCEL的：

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Text;
using System.Diagnostics;
using System.IO;
using Microsoft.Office.Interop.Excel;

namespace Excel
{
    public class Export
    {
        /// <summary>
        /// DataGridView匯出Excel
        /// </summary>
        /// <param name="strCaption">Excel檔案中的標題</param>
        /// <param name="myDGV">DataGridView 控制元件</param>
        /// <returns>0:成功;1:DataGridView中無記錄;2:Excel無法啟動;9999:異常錯誤</returns>
        public int ExportExcel(string strCaption, DataGridView myDGV, SaveFileDialog saveFileDialog)
        {
            int result = 9999;
            
            //儲存
            
            saveFileDialog.Filter = "Execl files (*.xls)|*.xls";
            saveFileDialog.FilterIndex = 0;
            saveFileDialog.RestoreDirectory = true;
            //saveFileDialog.CreatePrompt = true;
            saveFileDialog.Title = "Export Excel File";
            if ( saveFileDialog.ShowDialog()== DialogResult.OK)
            {
                if (saveFileDialog.FileName == "")
                {
                    MessageBox.Show("請輸入儲存檔名！");
                    saveFileDialog.ShowDialog();
                }
                    // 列索引，行索引，總列數，總行數
                int ColIndex = 0;
                int RowIndex = 0;
                int ColCount = myDGV.ColumnCount;
                int RowCount = myDGV.RowCount;

                if (myDGV.RowCount == 0)
                {
                    result = 1;
                }

                // 建立Excel物件
                Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.ApplicationClass();
                if (xlApp == null)
                {
                    result = 2;
                }
                try
                {
                    // 建立Excel工作薄
                    Microsoft.Office.Interop.Excel.Workbook xlBook = xlApp.Workbooks.Add(true);
                    Microsoft.Office.Interop.Excel.Worksheet xlSheet = (Microsoft.Office.Interop.Excel.Worksheet)xlBook.Worksheets[1];
                    // 設定標題
                    Microsoft.Office.Interop.Excel.Range range = xlSheet.get_Range(xlApp.Cells[1, 1], xlApp.Cells[1, ColCount]); //標題所佔的單元格數與DataGridView中的列數相同
                    range.MergeCells = true;
                    xlApp.ActiveCell.FormulaR1C1 = strCaption;
                    xlApp.ActiveCell.Font.Size = 20;
                    xlApp.ActiveCell.Font.Bold = true;
                    xlApp.ActiveCell.HorizontalAlignment = Microsoft.Office.Interop.Excel.Constants.xlCenter;
                    // 建立快取資料
                    object[,] objData = new object[RowCount + 1, ColCount];
                    //獲取列標題
                    foreach (DataGridViewColumn col in myDGV.Columns)
                    {
                        objData[RowIndex, ColIndex++] = col.HeaderText;
                    }
                    // 獲取資料
                    for (RowIndex = 1; RowIndex < RowCount; RowIndex++)
                    {
                        for (ColIndex = 0; ColIndex < ColCount; ColIndex++)
                        {
                            if (myDGV[ColIndex, RowIndex - 1].ValueType == typeof(string)
                                || myDGV[ColIndex, RowIndex - 1].ValueType == typeof(DateTime))//這裡就是驗證DataGridView單元格中的型別,如果是string或是DataTime型別,則在放入快取時在該內容前加入" ";
                            {
                                objData[RowIndex, ColIndex] = "" + myDGV[ColIndex, RowIndex - 1].Value;
                            }
                            else
                            {
                                objData[RowIndex, ColIndex] = myDGV[ColIndex, RowIndex - 1].Value;
                            }
                        }
                        System.Windows.Forms.Application.DoEvents();
                    }
                    // 寫入Excel
                    range = xlSheet.get_Range(xlApp.Cells[2, 1], xlApp.Cells[RowCount, ColCount]);
                    range.Value2 = objData;

                    xlBook.Saved = true;
                    xlBook.SaveCopyAs(saveFileDialog.FileName);
                }
                catch (Exception err)
                {
                    result = 9999;
                }
                finally
                {
                    xlApp.Quit();
                    GC.Collect(); //強制回收
                }
                //返回值
                result = 0;
            }
            
            return result;
        }


    }
}
 

這個優點是能設定樣式什麼的。缺點就是匯出速度慢...

以上兩種方法都是參考了很多料的..寫在這裡以便於相互學習..

補充一下：用第二種方法匯出excel會有格式方面的變化，比如身份證號碼按科學計演算法匯出了，不是按原先的模型

改進方法是在寫入excel時新增一個格式宣告：range.NumberFormatLocal = "@";

如：// 寫入Excel

range = xlSheet.get_Range(xlApp.Cells[2, 1], xlApp.Cells[RowCount + 2, ColCount]);
range.NumberFormatLocal = "@";
range.Value2 = objData;