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  • 【转】把Excel文件的数据导入到DataSet数据集中

    前几天做了这样的导入,当时在网上找了很多例子,都不错。但是由于本机的一些设置原因,有一些代码不能执行,最后找到一个可行性的方法来实现这个功能;

    看了一些Excel.Appliction方法导入,但是好像是需要一些配置,我照样配置了一下,可是还是不能用,无奈之下又换了种方法;

    filePath为文件的路径

    public static DataTable Import(string filePath)
        {
            DataTable rs = new DataTable();

            bool canOpen = false;

            OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;" +
            "Data Source=" + filePath + ";" +
            "Extended Properties=\"Excel 8.0;\"");

            try//尝试数据连接是否可用
            {
                conn.Open();
                conn.Close();
                canOpen = true;
            }
            catch { }

            if (canOpen)
            {

                //得到工作表的名称
                DataTable dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

                string tablename = dt.Rows[0][2].ToString().Trim();

                if (tablename.Length > 0)
                {
                    OleDbCommand myOleDbCommand = new OleDbCommand("SELECT * FROM [" + tablename + "]", conn);
                    OleDbDataAdapter myData = new OleDbDataAdapter(myOleDbCommand);
                    myData.Fill(rs);
                    conn.Close();
                }
                        }
            else//如何Excel的格式不是标准的需要转换一下( 只针对<table><tr><td></td></tr>)
            {
                System.IO.StreamReader tmpStream = File.OpenText(filePath);
                string tmpStr = tmpStream.ReadToEnd();
                tmpStream.Close();
                rs = GetDataTableFromString(tmpStr);
                tmpStr = "";
            }
            return rs;
        }

      //此方法来处理Excel的格式为表格(有tr、td)
        private static DataTable GetDataTableFromString(string tmpHtml)
        {
            string tmpStr=tmpHtml;
            DataTable TB=new DataTable();
            //先处理一下这个字符串,删除第一个<tr>之前合最后一个</tr>之后的部分
            int index=tmpStr.IndexOf("<tr");
            if(index>-1)
                tmpStr=tmpStr.Substring(index);
            else
                return TB;

            index=tmpStr.LastIndexOf("</tr>");
            if(index>-1)
                tmpStr=tmpStr.Substring(0,index+5);
            else
                return TB;

            bool existsSparator=false;
            char Separator=Convert.ToChar("^");

            //如果原字符串中包含分隔符“^”则先把它替换掉
            if(tmpStr.IndexOf(Separator.ToString())>-1)
            {
                existsSparator=true;
                tmpStr=tmpStr.Replace("^","^$&^");
            }

            //先根据“</tr>”分拆
            string[] tmpRow=tmpStr.Replace("</tr>","^").Split(Separator);
          
            for(int i=0;i<tmpRow.Length-1;i++)
            {
                DataRow newRow=TB.NewRow();

                string tmpStrI=tmpRow[i];
                if(tmpStrI.IndexOf("<tr")>-1)
                {
                    tmpStrI=tmpStrI.Substring(tmpStrI.IndexOf("<tr"));
                    if(tmpStrI.IndexOf("display:none")<0||tmpStrI.IndexOf("display:none")>tmpStrI.IndexOf(">"))
                    {
                        if (i == 0)
                            tmpStrI = tmpStrI.Replace("</th>", "^");//取表头
                        else
                            tmpStrI=tmpStrI.Replace("</td>","^");
                        string[] tmpField=tmpStrI.Split(Separator);

                        for(int j=0;j<tmpField.Length-1;j++)
                        {
                            tmpField[j]=RemoveString(tmpField[j],"<font>");
                            index=tmpField[j].LastIndexOf(">")+1;
                            if(index>0)
                            {
                                string field=tmpField[j].Substring(index,tmpField[j].Length-index);
                                if(existsSparator)
                                    field=field.Replace("^$&^","^");
                                if(i==0)
                                {
                                    string tmpFieldName=field;
                                    int sn=1;
                                    while(TB.Columns.Contains(tmpFieldName))
                                    {
                                        tmpFieldName=field+sn.ToString();
                                        sn+=1;
                                    }
                                    TB.Columns.Add(tmpFieldName);
                                }
                                else
                                {
                                    newRow[j]=field;
                                }
                            }//end of if(index>0)
                        }

                        if(i>0)
                        TB.Rows.Add(newRow);
                    }
                }
            }

            TB.AcceptChanges();
            return TB;
            }

            /// <summary>
            /// 从指定Html字符串中剔除指定的对象
            /// </summary>
            /// <param name="tmpHtml">Html字符串</param>
            /// <param name="remove">需要剔除的对象--例如输入"<font>"则剔除"<font ???????>"和"</font>>"</param>
            /// <returns></returns>
            public static string RemoveString(string tmpHtml, string remove)
            {
                tmpHtml = tmpHtml.Replace(remove.Replace("<", "</"), "");
                tmpHtml = RemoveStringHead(tmpHtml, remove);
                return tmpHtml;
            }

            /// <summary>
            /// 只供方法RemoveString()使用
            /// </summary>
            /// <returns></returns>
            private static string RemoveStringHead(string tmpHtml, string remove)
            {
                //为了方便注释,假设输入参数remove="<font>"
                if (remove.Length < 1) return tmpHtml;//参数remove为空:不处理返回
                if ((remove.Substring(0, 1) != "<") || (remove.Substring(remove.Length - 1) != ">")) return tmpHtml;//参数remove不是<?????>:不处理返回

                int IndexS = tmpHtml.IndexOf(remove.Replace(">", ""));//查找“<font”的位置
                int IndexE = -1;
                if (IndexS > -1)
                {
                    string tmpRight = tmpHtml.Substring(IndexS, tmpHtml.Length - IndexS);
                    IndexE = tmpRight.IndexOf(">");
                    if (IndexE > -1)
                        tmpHtml = tmpHtml.Substring(0, IndexS) + tmpHtml.Substring(IndexS + IndexE + 1);
                    if (tmpHtml.IndexOf(remove.Replace(">", "")) > -1)
                        tmpHtml = RemoveStringHead(tmpHtml, remove);
                }
                return tmpHtml;
            }

    private static int GetSheetIndex(byte[] FindTarget, byte[] FindItem)
            {
                int index = -1;

                int FindItemLength = FindItem.Length;
                if (FindItemLength < 1) return -1;
                int FindTargetLength = FindTarget.Length;
                if ((FindTargetLength - 1) < FindItemLength) return -1;

                for (int i = FindTargetLength - FindItemLength - 1; i > -1; i--)
                {
                    System.Collections.ArrayList tmpList = new System.Collections.ArrayList();
                    int find = 0;
                    for (int j = 0; j < FindItemLength; j++)
                    {
                        if (FindTarget[i + j] == FindItem[j]) find += 1;
                    }
                    if (find == FindItemLength)
                    {
                        index = i;
                        break;
                    }
                }
                return index;
            }

    注:需要导出格式为表格的Excel的,请查阅前面一篇文章便知

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  • 原文地址:https://www.cnblogs.com/5tao/p/1944465.html
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