将数据集导出到 excel 表

Question

我是 excel C# 自动化的新手，所以我对此感到困惑。我在数据集中导入了一个 excel，并且根据我的要求在数据集中做了一些更新。现在我想将该数据集导出到该输入 sheet，以便我可以看到在数据集中完成的更新反映在数据 sheet 中。将数据集导出到 excel 的最佳方法是什么？下面是我打开 excel sheet:

的代码

string sConnection = null;
OleDbConnection oleExcelConnection = default(OleDbConnection);
sConnection = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=c:\input.xls;Extended Properties=\"Excel 12.0;HDR=No;IMEX=1\"";
oleExcelConnection = new OleDbConnection(sConnection);
oleExcelConnection.Open();

string sqlquery = "Select * From [c:\input.xls]";
DataSet ds = new DataSet();
OleDbDataAdapter da = new OleDbDataAdapter(sqlquery, oleExcelConnection);
da.Fill(ds);
System.Data.DataTable dt = ds.Tables[0];

/* 10 to 12 linq queries on dt*/

-> now here I want to export the updated dt to input.xls

Answer 1

http://www.codeproject.com/Tips/705470/Read-and-Write-Excel-Documents-Using-OLEDB

private void WriteExcelFile()
{
    string connectionString = GetConnectionString();

using (OleDbConnection conn = new OleDbConnection(connectionString))
{
    conn.Open();
    OleDbCommand cmd = new OleDbCommand();
    cmd.Connection = conn;

    cmd.CommandText = "CREATE TABLE [table1] (id INT, name VARCHAR, datecol DATE );";
    cmd.ExecuteNonQuery();

    cmd.CommandText = "INSERT INTO [table1](id,name,datecol) VALUES(1,'AAAA','2014-01-01');";
    cmd.ExecuteNonQuery();

    cmd.CommandText = "INSERT INTO [table1](id,name,datecol) VALUES(2, 'BBBB','2014-01-03');";
    cmd.ExecuteNonQuery();

    cmd.CommandText = "INSERT INTO [table1](id,name,datecol) VALUES(3, 'CCCC','2014-01-03');";
    cmd.ExecuteNonQuery();

    cmd.CommandText = "UPDATE [table1] SET name = 'DDDD' WHERE id = 3;";
    cmd.ExecuteNonQuery();

    conn.Close();
}
}

Google是你的朋友=)

Answer 2

经过数小时的研究，我找到了一种使用数据表编写 excel 的方法。虽然，我最初的要求是更新原始的 sheet，但我想我必须乐于从头开始创建新的输出 sheet。解决方案如下：

//open file
StreamWriter wr = new StreamWriter(@"D:\Book1.xls");
// dt is the DataTable needed to be dumped in an excel sheet.
try
{

    for (int i = 0; i < dt.Columns.Count; i++)
    {
        wr.Write(dt.Columns[i].ToString().ToUpper() + "\t");
    }

    wr.WriteLine();

    //write rows to excel file
    for (int i = 0; i < (dt.Rows.Count); i++)
    {
        for (int j = 0; j < dt.Columns.Count; j++)
        {
            if (dt.Rows[i][j] != null)
            {
                wr.Write(Convert.ToString(dt.Rows[i][j]) + "\t");
            }
            else
            {
                wr.Write("\t");
            }
        }
        //go to next line
        wr.WriteLine();
    }
    //close file
    wr.Close();
}
catch (Exception ex)
{
    throw ex;
}

将数据集导出到 excel 表

exporting data set to excelsheet

c#

oledb

datatable

excel