zoukankan      html  css  js  c++  java
  • C#读取Excel文件时提示:无法指出的错误

    在保存excel文件时总提示对此目录没有操作权限,于是我又在根目录的webconfig里加了一句 <identity   impersonate="true"   />   .
    做了这样的修改后,生成的文件可以顺利保存了,但读取外部excel文件时总在xlsconn.open()这句出错;
    后来将根目录webconfig里的    <identity   impersonate="true"   />删除,加到子目录excelfile目录的webconfig里就一切OK了。

    public static DataSet ImportXlsToData(string fileName)
        {
          try
            {
                if (fileName == string.Empty)
                {
                    throw new ArgumentNullException("上传文件失败!");
                }
                //
                string oleDBConnString = String.Empty;
                oleDBConnString = "Provider=Microsoft.Jet.OLEDB.4.0;";
                oleDBConnString += "Data Source=";
                oleDBConnString += fileName;
                oleDBConnString += ";Extended Properties=Excel 8.0;";
                //
                OleDbConnection oleDBConn = null;
                OleDbDataAdapter oleAdMaster = null;
                System.Data.DataTable m_tableName = new System.Data.DataTable();
                DataSet ds = new DataSet();

                try
                {
                    oleDBConn = new OleDbConnection(oleDBConnString);
                    oleDBConn.Open();
                    m_tableName = oleDBConn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

                    if (m_tableName != null && m_tableName.Rows.Count > 0)
                    {
                        m_tableName.TableName = m_tableName.Rows[0]["TABLE_NAME"].ToString();
                    }
                    string sqlMaster;
                    sqlMaster = " SELECT *  FROM [" + m_tableName.TableName + "]";
                    oleAdMaster = new OleDbDataAdapter(sqlMaster, oleDBConn);
                    oleAdMaster.Fill(ds, "m_tableName");
                    oleAdMaster.Dispose();
                    oleDBConn.Close();
                    oleDBConn.Dispose();
                }
                catch (Exception ex)
                {
                    ErrorLog.AddLog(ex);
                    return null;
                }

                return ds;
                //测试是否提取数据
                //this.Datagrid1.DataSource =ds.Tables["m_tableName"];
                //this.Datagrid1.DataBind();
                //将Dataset中数据导入SQL
                //AddDatasetToSQL(ds);

            }
            catch (Exception ex)
            {
                return null;
            }
    }
    比较简单的做法是根目录的Web.Config文件不加<identity impersonate="true"/>
    对有下载文件的页面指定权限:
    <location path="forecast/SupplierPlan.aspx">
        <system.web>
          <identity impersonate="true"/>
        </system.web>
      </location>

  • 相关阅读:
    (4)Maven快速入门_4在Spring+SpringMVC+MyBatis+Oracle+Maven框架整合运行在Tomcat8中
    (3)Maven快速入门_3在Eclipse中创建Maven项目打包成jar
    (2)Maven快速入门_2maven在Eclipse中的设置
    (1)Maven快速入门_1maven安装
    (11)Microsoft office Word 2013版本操作入门_word中表格操作
    (10)Microsoft office Word 2013版本操作入门_word表格
    洛谷 P2144 [FJOI2007]轮状病毒
    洛谷 P2234 [HNOI2002]营业额统计
    【模板】主席树
    洛谷 P2572 [SCOI2010]序列操作
  • 原文地址:https://www.cnblogs.com/jacker1979/p/1538407.html
Copyright © 2011-2022 走看看