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  • C# 读取Excel文件代码

     

    片段 1

    using System.Data.OleDb;

    ...


    static void Main()
    {
    Application.Run(new Form1());
    }

    private void Form1_Load(object sender, System.EventArgs e)
    {
    DataTable myT=ExcelToDataTable("D:/文件/新武昌站点资料.xls","sheet1");
    String mystr=myT.Rows[0][0].ToString();
    this.textBox1.Text=mystr;
    }

    public static DataTable ExcelToDataTable(string strExcelFileName, string strSheetName)
    {
    //源的定义
    string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + strExcelFileName + ";" + "Extended Properties='Excel 8.0;HDR=NO;IMEX=1';";

    //Sql语句
    //string strExcel = string.Format("select * from [{0}$]", strSheetName); 这是一种方法
    string strExcel = "select * from   [sheet1$]";

    //定义存放的数据表
    DataSet ds = new DataSet();

    //连接数据源
    OleDbConnection conn = new OleDbConnection(strConn);

    conn.Open();

    //适配到数据源
    OleDbDataAdapter adapter = new OleDbDataAdapter(strExcel, strConn);
    adapter.Fill(ds, strSheetName);

    conn.Close();

    return ds.Tables[strSheetName];
    }


    很简单的代码,但是问题就出在连接字符串上面,后面一定要加上Extended Properties='Excel 8.0;HDR=NO;IMEX=1',HDR和IMEX也一定要配合使用,哈哈,老实说,我也不知道为什么,这样配合的效果最好,这是我艰苦调试的结果.IMEX=1应该是将所有的列全部视为文本,我也有点忘记了.至于HDR本来只是说是否要出现一行标题头而已,但是结果却会导致某些字段值丢失,所以其实我至今也搞不明白为什么,很可能是驱动的问题...

    片段 2

    提供两种方法:一个是直接打开excel文件,然后逐行读取,速度较慢;还有一种方法是通过OleDb连接,把excel文件作为数据源来读取
    方法一:这种直接读取单元格的方法释放很重要。

       Excel.Application excel = null;
       Excel.Workbooks wbs = null;
       Excel.Workbook wb = null;
       Excel.Worksheet ws = null;
       Excel.Range range1 = null;
       object Nothing = System.Reflection.Missing.Value;
        
       try
       {
        excel = new Excel.Application();
        excel.UserControl = true;
        excel.DisplayAlerts = false;
                        
        excel.Application.Workbooks.Open(this.FilePath,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing ) ;
        
        wbs = excel.Workbooks;
        wb = wbs[1];
        ws = (Excel.Worksheet)wb.Worksheets["Sheet2"];
        
             
        int rowCount = ws.UsedRange.Rows.Count;
        int colCount = ws.UsedRange.Columns.Count;
        if (rowCount <= 0)
         throw new InvalidFormatException("文件中没有数据记录");
        if (colCount < 4 )
         throw new InvalidFormatException("字段个数不对");
        
        for (int i = 0;i    {

         this.rowNo = i + 1;
         object[] row = new object[4];
         for (int j = 0;j<4;j++)
         {
          range1 = ws.get_Range(ws.Cells[i+2,j+1],ws.Cells[i+2,j+1]);
          row[j] = range1.Value;

          if (row[0] == null)
          {
           this.isNullRecord++;
           break;
          }
         }
                       
         if (this.isNullRecord > 0)
          continue;

         DataRow dataRow = this.readExcel(row);

         if (this.isNullRecord == 1)
          continue;
      
         if (this.verifyData(dataRow) == false)
          errFlag++;
      
         this.updateTableCurr(dataRow);
        }
        
       }
       finally
       {
        if (excel != null)
        {
         if (wbs != null)
         {
          if (wb != null)
          {
           if (ws != null)
           {
            if (range1 != null)
            {
             System.Runtime.InteropServices.Marshal.ReleaseComObject(range1);
             range1 = null;
            }
            System.Runtime.InteropServices.Marshal.ReleaseComObject(ws);
            ws = null;
           }
           wb.Close(false,Nothing,Nothing);
           System.Runtime.InteropServices.Marshal.ReleaseComObject(wb);
           wb = null;
          }
          wbs.Close();
          System.Runtime.InteropServices.Marshal.ReleaseComObject(wbs);
          wbs = null;
         }
         excel.Application.Workbooks.Close();
         excel.Quit();
         System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
         excel = null;
         GC.Collect();
        }
       }

    方法二:这里是fill进dataset,也可以返回OleDbDataReader来逐行读,数据较快
    注:这种方法容易把混合型的字段作为null值读取进来,解决办法是改造连接字符串
    strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Erp1912.xls;Extended Properties='Excel 8.0;HDR=Yes;IMEX=1'";
    通过Imex=1来把混合型作为文本型读取,避免null值,详细请见http://www.connectionstrings.com/
    private DataSet importExcelToDataSet(string FilePath)
    {
       string strConn;
       strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + FilePath + ";Extended Properties=Excel 8.0;";
       OleDbConnection conn = new OleDbConnection(strConn);
       OleDbDataAdapter myCommand = new OleDbDataAdapter("SELECT * FROM [Sheet1$]",strConn);
       DataSet myDataSet = new DataSet();
       try
       {
        myCommand.Fill(myDataSet);
       }
       catch(Exception ex)
       {
        throw new InvalidFormatException("该Excel文件的工作表的名字不正确," + ex.Message);
       }
       return myDataSet;
    }

    片段 3

    用c#读取excel文件,写到datagridview控件中

    用c#读取excel文件,写到datagridview控件中

    string strconn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\MyExcel.xls;Extended Properties=""Excel 8.0;HDR=Yes;IMEX=1''" " ;

                OleDbConnection conn = new OleDbConnection(strconn);

                conn.Open();

                if (bo == false)

                {

                    comboBox1.Items.Clear();

                    DataTable dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });

                    foreach (DataRow dr in dt.Rows)

                    {

                        comboBox1.Items.Add((String)dr["TABLE_NAME"]);

                        //MessageBox.Show((String)dr["TABLE_NAME"]);

                    }

                    //comboBox1.Text = comboBox1.Items[0].ToString();

                }

                else

                {

                    string sql = "select * from " + comboBox1.Text;

                    OleDbDataAdapter aper = new OleDbDataAdapter(sql, conn);

                    DataSet myset = new DataSet();

                    aper.Fill(myset, comboBox1.Text);

                    dataGridView1.DataSource = myset.Tables[comboBox1.Text];

                }

                conn.Close();

    备注:

    @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\MyExcel.xls;Extended Properties=""Excel 8.0;HDR=Yes;IMEX=1"""

    "HDR=Yes;" indicates that the first row contains columnnames, not data

    "IMEX=1;" tells the driver to always read "intermixed" data columns as text

    TIP! SQL syntax: "SELECT * FROM [sheet1$]" - i.e. worksheet name followed by a "$" and wrapped in "[" "]" brackets.

    如果第一行是数据而不是标题的话, 应该写: "HDR=No;"

    "IMEX=1;" tells the driver to always read "intermixed" data columns as text

    片段 4

    C#读取Excel文件数据    
    相当简单,Excel就像数据库,每个Sheet就是一个Table. Microsoft.Jet.OLEDB驱动.
    之后是DataReader循环,或DataSet处理都非常简单.

    HTTP://BLOG.CSDN.NET/CRABO/
    注意:数据类型的转换!!

    #region set connection
       string strConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source= "+this.txtPath.Text+";Extended Properties=Excel 8.0;";
       myDataReader = null;
    craboDbConnection = new OleDbConnection(strConn);
       OleDbCommand myOleDbCommand = new OleDbCommand("SELECT * FROM [Sheet1$]", myOleDbConnection);
       #endregion

       try
       {
        myOleDbConnection.Open();
        myDataReader = myOleDbCommand.ExecuteReader();
        while (myDataReader.Read())
        {
           this.txtSeq.Text=Convert.ToString(myDataReader.GetValue(0));//列1
           this.txtName.Text=Convert.ToString(myDataReader.GetValue(1));//列2
           this.txtPIN.Text=Convert.ToString(myDataReader.GetValue(2));//列3
        }
    }
       #region Catch
       catch(System.Threading.ThreadAbortException e)
       {
        System.Threading.Thread.ResetAbort();
        this.lblResult.Text = "线程被中断..."+e.Message;
       }
       catch(Exception ex)
       {
        System.Windows.Forms.MessageBox.Show(ex.ToString());
       }
       finally
       {
        // Always call Close when done reading.
        if (myDataReader != null)
         myDataReader.Close();

        // Close the connection when done with it.
        if (craboDbConnection!=null && craboDbConnection.State == ConnectionState.Open)
         craboDbConnection.Close();

        if(webResponse!=null)
         webResponse.Close();
       }
       #endregion

     

    转自:http://hi.baidu.com/dogslife/blog/item/5eb3310816c733d663d98667.html

     

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Text;
    using System.Windows.Forms;
    using System.Collections;   
    using System.Data.OleDb;   

    namespace xml
    {
        
    public partial class Form1 : Form
        {
            
    public Form1()
            {
                InitializeComponent();
      
                  
            }
     

            
    private void button1_Click(object sender, EventArgs e)
            {

            }

            
    private void button1_Click_1(object sender, EventArgs e)
            {
                OpenFileDialog openfile 
    = new OpenFileDialog();
                openfile.Filter 
    = "工作薄(*.xls)|*.xls|所有文件(*.*)|*.*";
                
    if (openfile.FilterIndex == 1 && openfile.ShowDialog() == DialogResult.OK)
            ExcelToDS(openfile .FileName );

               
            }
            
    public DataSet ExcelToDS(string path)
            {

              
                    
    string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + @path   + ";" + "Extended Properties=Excel 8.0;";
                    OleDbConnection conn 
    = new OleDbConnection(strConn);
                    conn.Open();
                    
    string strExcel = "";
                    OleDbDataAdapter myCommand 
    = null;
                    DataSet ds 
    = null;
                    strExcel 
    = "select * from [sheet1$]";
                    myCommand 
    = new OleDbDataAdapter(strExcel, strConn);
                    DataTable table1 
    = new DataTable();
                    ds 
    = new DataSet();
                    myCommand.Fill(table1);
                    dataGridView1.DataSource 
    = table1;
                    
    return ds;
                
            } 
     

        }
    }

    转自:http://www.cnblogs.com/Caceolod/articles/1334985.html

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  • 原文地址:https://www.cnblogs.com/bicabo/p/1449906.html
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