C# vs2017 winForm 用Microsoft.Office.Interop.Excel導入Excel文件到datagridview（解決沒法導入不規範Excel文件問題，可是導入速度很慢）

1.在項目引用NuGet中安裝Microsoft.Office.Interop.Excel

2.在cs文件頭部添加命名空間

using System.Reflection; using Excel = Microsoft.Office.Interop.Excel; using System.Diagnostics;

3.窗體界面（灰色部分是datagridview1）

4.代碼部分

using System; using System.Windows.Forms; using System.Reflection; using Excel = Microsoft.Office.Interop.Excel; using System.Diagnostics; namespace InputExcelTest2 { public partial class Form_SelectFile : Form { public Form_SelectFile() { InitializeComponent(); } private void BtnCancel_Click(object sender, EventArgs e) { Close(); } private void BtnSelectFile_Click(object sender, EventArgs e) {//選擇文件
            openFileDialog1.Filter = "XLS文件|*.xls|XLSX文件|*.xlsx";//篩選文件類型
            openFileDialog1.FileName = ""; if (openFileDialog1.ShowDialog() == DialogResult.OK) { OpenExcel(openFileDialog1.FileName); } openFileDialog1.Dispose(); } private void OpenExcel(string strFileName) { object missing = Missing.Value; Excel.Application excel = new Excel.Application();//啓動excel程序
            try { if (excel == null) { MessageBox.Show("沒法訪問Excel程序，請從新安裝Microsoft Office Excel。"); } else { excel.Visible = false;//設置調用引用的Excel文件是否可見
                    excel.UserControl = true;//設置調用引用的Excel是由用戶建立或打開的 // 以只讀的形式打開EXCEL文件（工做簿）想了解這堆參數請訪問https://msdn.microsoft.com/zh-cn/library/office/microsoft.office.interop.excel.workbooks.open.aspx
                    Excel.Workbook wb = excel.Application.Workbooks.Open(strFileName, missing, true, missing, missing, missing, missing, missing, missing, true, missing, missing, missing, missing, missing); //取得第一個工做表
                    Excel.Worksheet ws = (Excel.Worksheet)wb.Worksheets[1];//索引從1開始 //取得總記錄行數(包括標題列) 
                    int rowCount = ws.UsedRange.Cells.Rows.Count; //獲得行數 
                    int colCount = ws.UsedRange.Cells.Columns.Count;//獲得列數 //初始化datagridview1
 dataGridView1.Rows.Clear(); dataGridView1.Columns.Clear(); //取得第一行，生成datagridview標題列(下標是從1開始的)
                    for (int i = 1; i <= colCount; i++) { string cellStr = ws.Cells[1, i].Value2.ToString().Trim(); dataGridView1.Columns.Add("column"+i,cellStr); } //取得數據(不包括標題列)
                    for(int i = 2; i <= rowCount; i++) {//循環行
                        int index = dataGridView1.Rows.Add(); if (ws.Rows[i] != null) { for(int j = 1; j <= colCount; j++) {//循環列
                                if (ws.Cells[i, j].Value2 == null) {//跳過空的單元格
                                    continue; } dataGridView1.Rows[index].Cells[j-1].Value = ws.Cells[i, j].Value2.ToString().Trim(); } } } } } catch(Exception ex) { MessageBox.Show("讀取Excel文件失敗： "+ex.Message); } finally { CloseExcel(excel);//關閉Excel進程
 } } private void CloseExcel(Excel.Application excel) {//關閉Excel進程
 excel.Quit(); excel = null; Process[] procs = Process.GetProcessesByName("excel"); foreach (Process pro in procs) { pro.Kill();//殺掉進程 
 } GC.Collect(); } } }