【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