使用 C# 将数据从 SQL Server 移动到 Excel

Question

我正在尝试使用 WinForms 通过 C# 表单将数据从 SQL Server 2012 移动到 Excel 2010。我拥有的数据包含一个名为“上诉”的列，我想在 Excel 工作簿中为其创建单独的工作表。我想用“上诉”的名称标记标签。我似乎无法获得的部分实际上是将数据放入我刚刚创建和标记的相关选项卡中。有更多经验的人可以帮助我吗？请注意，表格和值是实际表格的简化版本。

CREATE TABLE [dbo].[Appeals](
    [Appeal] [nchar](10) NULL,
    [Member_ID] [varchar](10) NULL,
    [Amount] [money] NULL,
    [DateGiven] [date] NULL
) ON [PRIMARY]


insert into Appeals values ('6Y','101',50,'2-15-2016')
insert into Appeals values ('6Y','209',100,'2-14-2016')
insert into Appeals values ('6Y','218',200,'2-12-2016')
insert into Appeals values ('7G','102',300,'1-15-2016')
insert into Appeals values ('7G','209',20,'2-21-2016')
insert into Appeals values ('WR','108',50,'1-22-2016')
insert into Appeals values ('WR','198',100,'1-29-2016')
insert into Appeals values ('WR','303',500,'1-31-2016')
insert into Appeals values ('WR','312',150,'7-19-2016')


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using Excel = Microsoft.Office.Interop.Excel; 


       private void button7_Click(object sender, EventArgs e)
        {
            SqlConnection cnn;
            string connectionString = null;

            object misValue = System.Reflection.Missing.Value;

            connectionString = "data source=D7010-H14NBZ1\\SQLEXPRESS;initial catalog=iTest;user id=TestUser;password=testPW;";
            StringBuilder query = new StringBuilder();

            cnn = new SqlConnection(connectionString);
            cnn.Open();
            query.Append("SELECT        Appeal, Member_ID, ");
            query.Append("Amount, DateGiven ");
            query.Append("FROM  dbo.Appeals ");
            query.Append("WHERE        (Appeal IN (N'6Y', N'7G', N'WR')) ");
            query.Append("ORDER BY Appeal DESC");
            SqlDataAdapter dscmd = new SqlDataAdapter(query.ToString(), cnn);
            DataTable dt = new DataTable();
            dscmd.Fill(dt);

            Excel.Application oXL;
            Excel._Workbook oWB;
            Excel._Worksheet oSheet;

            oXL = new Excel.Application();
            oXL.Visible = true;

            oWB = (Excel._Workbook)(oXL.Workbooks.Add(misValue));
            oSheet = (Excel._Worksheet)oWB.ActiveSheet;

            try
            {
                DataTable dtAppCode =
                        dt.DefaultView.ToTable(true, "Appeal");

                foreach (DataRow appcode in dtAppCode.Rows)
                {
                    oSheet = (Excel._Worksheet)oXL.Worksheets.Add();
                    oSheet.Name = appcode[0].ToString().Replace(" ", "").
                        Replace("  ", "").Replace("/", "").
                            Replace("\\", "").Replace("*", ""); ;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                GC.Collect();
            }

            oXL.Visible = true;
            oXL.UserControl = true;

            oWB.SaveAs(@"H:\Appeals2.xlsx",
                AccessMode: Excel.XlSaveAsAccessMode.xlShared);

        }
      }
    }

Answer 1

这被称为使用 C# 将数据从 SQL 数据库导出到 Excel。这真的很容易实现和理解。

CodePlex 提供称为 ClosedXML 的 API。你可以在这里找到它：https://closedxml.codeplex.com/

ClosedXML 允许创建不同的工作簿和工作表来导出 SQL 数据。

使用 ClosedXML DLL，您可以非常轻松地导出数据。

protected void button7_Click(object sender, EventArgs e)
    {
    string connectionstring;

    connectionstring = """data source=D7010-H14NBZ1\\SQLEXPRESS;initial catalog=iTest;user id=TestUser;password=testPW;";

    string query = "SELECT Appeal, Member_ID, Amount, DateGiven FROM  dbo.Appeals WHERE Appeal IN (N'6Y', N'7G', N'WR') ORDER BY Appeal DESC";

    SqlConnection connection = new SqlConnection(connectionstring);
        connection.Open();

        SqlCommand command = new SqlCommand(query, connection);

        DataTable data = new DataTable();

        using (SqlDataAdapter a = new SqlDataAdapter(command))
        {
            a.Fill(data);
            using (XLWorkbook wb = new XLWorkbook())
            {
                wb.Worksheets.Add(data, "Excel Export");

                Response.Clear();
                Response.Buffer = true;
                Response.Charset = "";
                Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                Response.AddHeader("content-disposition", "attachment;filename=Excel Export.xlsx");
                using (MemoryStream MyMemoryStream = new MemoryStream())
                {
                    wb.SaveAs(MyMemoryStream);
                    MyMemoryStream.WriteTo(Response.OutputStream);
                    Response.Flush();
                    Response.End();
                }
            }
        }
}

这肯定会帮助你:)

Answer 2

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Windows.Forms;
    using System.Data.SqlClient;
    using Excel = Microsoft.Office.Interop.Excel; 

    namespace WindowsFormsApplication8
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }

            private void button1_Click(object sender, EventArgs e)
            {
                SqlConnection cnn;
                string connectionString = null;
                string data = null;
                int i = 0;
                int j = 0;
                int h = 1;
                int Appeal_ID = 20;
                object misValue = System.Reflection.Missing.Value;

                label1.Text = "Processing......";

                connectionString = "data source=D7010-H14NBZ1\\SQLEXPRESS;initial catalog=itest;user id=xxxx;password=xxxx;";
                StringBuilder query = new StringBuilder();

                cnn = new SqlConnection(connectionString);
                cnn.Open();

                Excel.Application oXL;
                Excel._Workbook oWB;
                Excel._Worksheet oSheet;

                oXL = new Excel.Application();
                oWB = (Excel._Workbook)(oXL.Workbooks.Add(misValue));
                oSheet = (Excel._Worksheet)oWB.ActiveSheet;

                for (h = 48; h >= 1; h--)
                {
                    query.Append("SELECT     TOP (100) PERCENT dbo.FDN_GivingAppeal_Main.Appeal_ID, dbo.FDN_GivingAppeal_Main.ID, dbo.FDN_GivingAppeal_Main.Appeal,                 dbo.vBoCsContact.MemberType, ");
                    query.Append("dbo.vBoCsContact.Title, dbo.vBoCsContact.Prefix, dbo.vBoCsContact.FirstName, dbo.vBoCsContact.MiddleName AS MI, dbo.vBoCsContact.LastName, ");
                    query.Append("dbo.vBoCsContact.Suffix, dbo.vBoCsContact.Designation, dbo.vBoCsContact.Informal, dbo.vBoCsContact.Email, dbo.vBoCsContact.Company, ");
                    query.Append("dbo.vBoCsAddress.Address1, dbo.vBoCsAddress.Address2, dbo.vBoCsAddress.City, dbo.vBoCsAddress.StateProvince, dbo.vBoCsAddress.Zip, ");
                    query.Append("dbo.vBoCsAddress.Country, dbo.vBoCsAddress.Phone, dbo.FDN_GivingAppeal_Main.Amount AS YrTotal_LastGivingYr,               dbo.FDN_GivingAppeal_Main.LastTransDate, ");
                    query.Append("dbo.FDN_GivingAppeal_Main.LastTransAmt, dbo.FDN_GivingAppeal_Main.LargestGiving, dbo.FDN_GivingAppeal_Main.LifetimeTotal, ");
                    query.Append("dbo.FDN_GivingAppeal_Main.FiscalYear AS LastGivingYr, dbo.FDN_GivingAppeal_Main.CapitalCampaign, dbo.FDN_GivingAppeal_Main.P2GScore, ");
                    query.Append("dbo.FDN_GivingAppeal_Main.InnerCircle ");
                    query.Append("FROM         dbo.FDN_GivingAppeal_Main INNER JOIN ");
                    query.Append("dbo.FDN_AppealCode_Sort ON dbo.FDN_GivingAppeal_Main.Appeal_ID = dbo.FDN_AppealCode_Sort.ID AND  ");
                    query.Append("dbo.FDN_GivingAppeal_Main.Appeal = dbo.FDN_AppealCode_Sort.Appeal_code INNER JOIN  ");
                    query.Append("dbo.vBoCsContact ON dbo.FDN_GivingAppeal_Main.ID = dbo.vBoCsContact.ID INNER JOIN ");
                    query.Append("dbo.vBoCsAddress ON dbo.vBoCsContact.ID = dbo.vBoCsAddress.ID ");
                    query.Append("WHERE    (dbo.vBoCsAddress.PreferredMail = 1) AND (dbo.vBoCsAddress.BadAddress <> 'BAD') AND  (dbo.FDN_GivingAppeal_Main.Appeal_ID = " +              Appeal_ID + ") AND   Appeal_Sort in(" + h + ") ");
                    query.Append("ORDER BY dbo.FDN_AppealCode_Sort.Appeal_Sort desc, dbo.vBoCsContact.LastName, dbo.vBoCsContact.FirstName; ");
                    SqlDataAdapter dscmd = new SqlDataAdapter(query.ToString(), cnn);
                    DataTable dt = new DataTable();
                    dscmd.Fill(dt);
                    query.Clear();

                    try
                    {

                        oSheet = (Excel._Worksheet)oXL.Worksheets.Add();
                        oSheet.Name = dt.Rows[0]["Appeal"].ToString().Replace(" ", "").
                            Replace("  ", "").Replace("/", "").
                                Replace("\\", "").Replace("*", "");


                        for (i = 0; i <= dt.Rows.Count - 1; i++)
                        {
                            for (j = 0; j <= dt.Columns.Count - 1; j++)
                            {
                                data = dt.Rows[i].ItemArray[j].ToString();
                                oSheet.Cells[i + 1, j + 1] = data;

                            }
                        }

                    }

                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }
                    finally
                    {
                        GC.Collect();
                    }
                }


                oWB.SaveAs(@"H:\4862appeals1.xlsx",
                   AccessMode: Excel.XlSaveAsAccessMode.xlShared);

                oWB.Close(true, misValue, misValue);
                oXL.Quit();

                label1.Text = "Click button to start";     
            }
        }
    }

Answer 3

使用 EPPlus NuGet 包，it's very easy。

public class TestObject
{
    public int Col1 { get; set; }
    public int Col2 { get; set; }
    public string Col3 { get; set; }
    public DateTime Col4 { get; set; }
}

[TestMethod]
public void LoadFromCollection_MemberList_Test()
{
    //https://stackoverflow.com/questions/32587834/epplus-loadfromcollection-text-converted-to-number/32590626#32590626

    var TestObjectList = new List<TestObject>();
    for (var i = 0; i < 10; i++)
        TestObjectList.Add(new TestObject {Col1 = i, Col2 = i*10, Col3 = (i*10) + "E4"});

    //Create a test file
    var fi = new FileInfo(@"c:\temp\LoadFromCollection_MemberList_Test.xlsx");
    if (fi.Exists)
        fi.Delete();

    using (var pck = new ExcelPackage(fi))
    {
        //Do NOT include Col1
        var mi = typeof (TestObject)
            .GetProperties()
            .Where(pi => pi.Name != "Col1")
            .Select(pi => (MemberInfo)pi)
            .ToArray();

        var worksheet = pck.Workbook.Worksheets.Add("Sheet1");
        worksheet.Cells.LoadFromCollection(
            TestObjectList
            , true
            , TableStyles.Dark1
            , BindingFlags.Public| BindingFlags.Instance
            , mi);

        pck.Save();
    }
}

请注意 Col1 不在输出中：