方法一：(拷贝直接可以使用，适合大批量资料,
上万笔)
Microsoft.Office.Interop.Excel.Application appexcel =
new
Microsoft.Office.Interop.Excel.Application();
SaveFileDialog
savefiledialog = new
SaveFileDialog();
System.Reflection.Missing miss =
System.Reflection.Missing.Value;
appexcel = new
Microsoft.Office.Interop.Excel.Application();
Microsoft.Office.Interop.Excel.Workbook
workbookdata;
Microsoft.Office.Interop.Excel.Worksheet
worksheetdata;
Microsoft.Office.Interop.Excel.Range
rangedata;
//设置对象不可见
appexcel.Visible =
false;
System.Globalization.CultureInfo currentci =
System.Threading.Thread.CurrentThread.CurrentCulture;
System.Threading.Thread.CurrentThread.CurrentCulture
= new System.Globalization.CultureInfo("en-us");
workbookdata
= appexcel.Workbooks.Add(miss);
worksheetdata =
(Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets.Add(miss,
miss, miss, miss);
//给工作表赋名称
worksheetdata.Name =
"saved";
for (int i = 0; i < dt.Columns.Count;
i++)
{
worksheetdata.Cells[1,
i + 1] =
dt.Columns[i].ColumnName.ToString();
}
//因为第一行已经写了表头，所以所有数据都应该从a2开始
rangedata
= worksheetdata.get_Range("a2",
miss);
Microsoft.Office.Interop.Excel.Range xlrang =
null;
//irowcount为实际行数，最大行
int irowcount =
dt.Rows.Count;
int iparstedrow = 0, icurrsize =
0;
//ieachsize为每次写行的数值，可以自己设置
int ieachsize =
1000;
//icolumnaccount为实际列数，最大列数
int icolumnaccount =
dt.Columns.Count;
//在内存中声明一个ieachsize×icolumnaccount的数组，ieachsize是每次最大存储的行数，icolumnaccount就是存储的实际列数
object[,]
objval = new object[ieachsize, icolumnaccount];
icurrsize =
ieachsize;
while (iparstedrow
< irowcount)
{
if
((irowcount - iparstedrow) <
ieachsize)
icurrsize
= irowcount -
iparstedrow;
//用for循环给数组赋值
for
(int i = 0; i < icurrsize;
i++)
{
for
(int j = 0; j < icolumnaccount;
j++)
objval[i,
j] = dt.Rows[i +
iparstedrow][j].ToString();
System.Windows.Forms.Application.DoEvents();
}
string
X = "A" + ((int)(iparstedrow +
2)).ToString();
string col =
"";
if (icolumnaccount <=
26)
{
col
= ((char)(‘A‘ + icolumnaccount - 1)).ToString() + ((int)(iparstedrow
+ icurrsize +
1)).ToString();
}
else
{
col
= ((char)(‘A‘ + (icolumnaccount / 26 - 1))).ToString() + ((char)(‘A‘
+ (icolumnaccount % 26 - 1))).ToString() + ((int)(iparstedrow +
icurrsize +
1)).ToString();
}
xlrang
= worksheetdata.get_Range(X, col);
//
调用range的value2属性，把内存中的值赋给excel
xlrang.Value2
= objval;
iparstedrow = iparstedrow +
icurrsize;
}
//保存工作表
System.Runtime.InteropServices.Marshal.ReleaseComObject(xlrang);
xlrang
= null;
//调用方法关闭excel进程
appexcel.Visible =
true;
方法二：(自己建函数，适合大批量资料,
上万笔)
using System.IO;
private void
dataTableToCsv(DataTable table, string
file)
{
string title =
"";
FileStream fs = new
FileStream(file,
FileMode.OpenOrCreate);
//FileStream
fs1 = File.Open(file, FileMode.Open,
FileAccess.Read);
StreamWriter sw =
new StreamWriter(new BufferedStream(fs),
System.Text.Encoding.Default);
for
(int i = 0; i < table.Columns.Count;
i++)
{
title
+= table.Columns[i].ColumnName + "\t";
//栏位：自动跳到下一单元格
}
title
= title.Substring(0, title.Length - 1) +
"\n";
sw.Write(title);
foreach
(DataRow row in
table.Rows)
{
string
line =
"";
for (int
i = 0; i < table.Columns.Count;
i++)
{
line
+= row[i].ToString().Trim() + "\t";
//内容：自动跳到下一单元格
}
line
= line.Substring(0, line.Length - 1) +
"\n";
sw.Write(line);
}
sw.Close();
fs.Close();
}
dataTableToCsv(dt,
@"c:\1.xls");
//调用函数
System.Diagnostics.Process.Start(@"c:\1.xls");
//打开excel文件
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方法三:(可以自己调整单元格的格式,适合小批量的数量)
try
{
//没有数据的话就不往下执行
if
(dataGridView1.Rows.Count ==
0)
return;
//实例化一个Excel.Application对象
Microsoft.Office.Interop.Excel.Application
excel = new
Microsoft.Office.Interop.Excel.Application();
//让后台执行设置为不可见，为true的话会看到打开一个Excel，然后数据在往里写
//excel.Visible
= false;
excel.Visible =
true;
//新增加一个工作簿，Workbook是直接保存，不会弹出保存对话框，加上Application会弹出保存对话框，值为false会报错
excel.Application.Workbooks.Add(true);
//生成Excel中列头名称
for
(int i = 0; i < dataGridView1.Columns.Count;
i++)
{
excel.Cells[1,
i + 1] =
dataGridView1.Columns[i].HeaderText;
}
//把DataGridView当前页的数据保存在Excel中
for
(int i = 0; i < dataGridView1.Rows.Count - 1;
i++)
{
for
(int j = 0; j < dataGridView1.Columns.Count;
j++)
{
if
(dataGridView1[j, i].ValueType ==
typeof(string))
{
excel.Cells[i
+ 2, j + 1] = "‘" + dataGridView1[j,
i].Value.ToString();
}
else
{
excel.Cells[i
+ 2, j + 1] = dataGridView1[j,
i].Value.ToString();
}
}
}
//设置禁止弹出保存和覆盖的询问提示框
excel.DisplayAlerts
= false;
excel.AlertBeforeOverwriting
=
false;
////保存工作簿
//excel.Application.Workbooks.Add(true).Save();
////保存excel文件
//excel.Save("D:"
+
"\\KKHMD.xls");
////确保Excel进程关闭
//excel.Quit();
//可以直接打开文件
//excel =
null;
}
catch (Exception
ex)
{
MessageBox.Show(ex.Message,
"错误提示");
}
Excel.output((DataTable)dataGridView1.DataSource);
C#中datatable导出excel(三种方法)