如何将DataTable导入Access数据库? 如何将DataTable导入Access数据库? 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 =============设置属性 this.dataGridView1.SelectionMode = System.Windows.Forms.DataGridViewSelectionMode.FullRowSelect; using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using Microsoft.Office.Interop.Excel;using System.Data.SqlClient;using System.Data.OleDb;using System.Reflection;namespace ExcelPrj{ /// <summary> /// Excel 系统中的主文件Excel.exe 本身就是 COM 组件,通过在.NET 项目中引用Exel.exe 文件可以实现对Excel 的功能控制 /// 与COM 组件相互操作是通过使用"包装类"(Wrapper Class) 和"代理"(Proxy) 的机制实现的.包装类使.NET 程序可以识别COM 组件提供的接口,而代理类则是提供对 COM 接口的访问 /// </summary> public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button3_Click(object sender, EventArgs e) { ExportTasks(Bind(), dataGridView1); } //如果 Excel 安装在计算机上,侧导出表格内容到 Excel public void ExportTasks(DataSet TasksData, DataGridView TasksGridView) { // 定义要使用的Excel 组件接口 // 定义Application 对象,此对象表示整个Excel 程序 Microsoft.Office.Interop.Excel.Application excelApp = null ; // 定义Workbook对象,此对象代表工作薄 Microsoft.Office.Interop.Excel.Workbook workBook; // 定义Worksheet 对象,此对象表示Execel 中的一张工作表 Microsoft.Office.Interop.Excel.Worksheet ws=null; //定义Range对象,此对象代表单元格区域 Microsoft.Office.Interop.Excel.Range r; int row = 1; int cell = 1; try { //初始化 Application 对象 excelApp excelApp = new Microsoft.Office.Interop.Excel.Application(); //在工作薄的第一个工作表上创建任务列表 workBook = excelApp.Workbooks.Add(XlWBATemplate.xlWBATWorksheet); ws =(Worksheet)workBook.Worksheets[1]; // 命名工作表的名称为 "Task Management" ws.Name = "Task Management"; #region 创建表格的列头 // 遍历数据表中的所有列 foreach (DataGridViewColumn cs in TasksGridView.Columns) { // 假如并不想把主键也显示出来 if (cs.HeaderText != "编号") { ws.Cells[row, cell] = cs.HeaderText; r = (Range)ws.Cells[row, cell]; ws.get_Range(r, r).HorizontalAlignment = Microsoft.Office.Interop.Excel.XlVAlign.xlVAlignCenter; //此处用来设置列的样式 cell++; } } // 创建行,把数据视图记录输出到对应的Excel 单元格 for (int i = 2; i < TasksData.Tables[0].Rows.Count; i++) { for (int j = 1; j < TasksData.Tables[0].Columns.Count; j++) { ws.Cells[i, j] = TasksData.Tables[0].Rows[i][j].ToString(); // r = (Range)ws.Cells[i,j]; Range rg = (Range)ws.get_Range(ws.Cells[i, j], ws.Cells[i, j]); rg.EntireColumn.ColumnWidth = 20; // rg.Columns.AutoFit(); rg.NumberFormatLocal = "@"; } } #endregion } catch (Exception ex) { MessageBox.Show(ex.ToString()); } //显示 Excel excelApp.Visible = true; } private void button5_Click(object sender, EventArgs e) { DataSet ds = Bind(); dataGridView1.DataSource = ds.Tables[0]; } private DataSet Bind() { SqlConnection conn = new SqlConnection("Server=.;Database=testManage;Integrated Security=SSPI"); SqlDataAdapter da = new SqlDataAdapter("select FNumber,FExamNum,FName,FSex,FJobAdd,FCardID,FBirDate from stuInfo", conn); DataSet ds = new DataSet(); da.Fill(ds); return ds; } private void button2_Click(object sender, EventArgs e) { SaveFileDialog sfd = new SaveFileDialog(); sfd.Title = "请选择将导出的EXCEL文件存放路径"; sfd.FileName = System.DateTime.Now.ToShortDateString() + "-学生信息"; sfd.Filter = "Excel文档(*.xls)|*.xls"; sfd.ShowDialog(); if (sfd.FileName != "") { Microsoft.Office.Interop.Excel.Application excelApp = new Microsoft.Office.Interop.Excel.Application(); if (excelApp == null) { MessageBox.Show("无法创建Excel对象,可能您的机器未安装Excel"); } else { Microsoft.Office.Interop.Excel.Workbooks workbooks = excelApp.Workbooks; Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(XlWBATemplate.xlWBATWorksheet); Microsoft.Office.Interop.Excel.Worksheet worksheet =(Worksheet) workbook.Worksheets[1]; DataSet ds=Bind(); for (int i = 1; i < ds.Tables[0].Rows.Count; i++) { for (int j = 1; j < ds.Tables[0].Columns.Count;j++ ) { if (i == 1) { worksheet.Cells[i, j] = dataGridView1.Columns[j].HeaderText; } worksheet.Cells[i+1, j] = ds.Tables[0].Rows[i][j].ToString(); } } //保存方式一:保存WorkBook //workbook.SaveAs(@"F:\CData.xls", // Missing.Value,Missing.Value,Missing.Value,Missing.Value,Missing.Value, // Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange,Missing.Value,Missing.Value,Missing.Value, // Missing.Value,Missing.Value); //保存方式二:保存WorkSheet // worksheet.SaveAs(@"F:\CData2.xls", // Missing.Value, Missing.Value, Missing.Value, Missing.Value, // Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value); ////保存方式三 //workbook.Saved = true; //workbook.SaveCopyAs(sfd.FileName); System.Runtime.InteropServices.Marshal.ReleaseComObject(worksheet); worksheet = null; System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook); workbook = null; workbooks.Close(); System.Runtime.InteropServices.Marshal.ReleaseComObject(workbooks); workbooks = null; excelApp.Quit(); System.Runtime.InteropServices.Marshal.ReleaseComObject(excelApp); excelApp = null; MessageBox.Show("导出Excel完成!"); } } 这是导入EXCEL啊,不是导入Access DataTable.Columns.Add()时,提示“未处理NullReferenceException,未将对象引用设置到对象实例”~求指导,急~ C++使用C#创建的DLL,C#的DLL只能放在C++生成的EXE同目录下吗? 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设置属性
this.dataGridView1.SelectionMode = System.Windows.Forms.DataGridViewSelectionMode.FullRowSelect;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Microsoft.Office.Interop.Excel;
using System.Data.SqlClient;
using System.Data.OleDb;
using System.Reflection;
namespace ExcelPrj
{
/// <summary>
/// Excel 系统中的主文件Excel.exe 本身就是 COM 组件,通过在.NET 项目中引用Exel.exe 文件可以实现对Excel 的功能控制
/// 与COM 组件相互操作是通过使用"包装类"(Wrapper Class) 和"代理"(Proxy) 的机制实现的.包装类使.NET 程序可以识别COM 组件提供的接口,而代理类则是提供对 COM 接口的访问
/// </summary>
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
} private void button3_Click(object sender, EventArgs e)
{
ExportTasks(Bind(), dataGridView1);
}
//如果 Excel 安装在计算机上,侧导出表格内容到 Excel
public void ExportTasks(DataSet TasksData, DataGridView TasksGridView)
{
// 定义要使用的Excel 组件接口
// 定义Application 对象,此对象表示整个Excel 程序
Microsoft.Office.Interop.Excel.Application excelApp = null ;
// 定义Workbook对象,此对象代表工作薄
Microsoft.Office.Interop.Excel.Workbook workBook;
// 定义Worksheet 对象,此对象表示Execel 中的一张工作表
Microsoft.Office.Interop.Excel.Worksheet ws=null;
//定义Range对象,此对象代表单元格区域
Microsoft.Office.Interop.Excel.Range r; int row = 1; int cell = 1;
try
{
//初始化 Application 对象 excelApp
excelApp = new Microsoft.Office.Interop.Excel.Application();
//在工作薄的第一个工作表上创建任务列表
workBook = excelApp.Workbooks.Add(XlWBATemplate.xlWBATWorksheet); ws =(Worksheet)workBook.Worksheets[1]; // 命名工作表的名称为 "Task Management"
ws.Name = "Task Management"; #region 创建表格的列头
// 遍历数据表中的所有列
foreach (DataGridViewColumn cs in TasksGridView.Columns)
{
// 假如并不想把主键也显示出来
if (cs.HeaderText != "编号")
{
ws.Cells[row, cell] = cs.HeaderText;
r = (Range)ws.Cells[row, cell]; ws.get_Range(r, r).HorizontalAlignment = Microsoft.Office.Interop.Excel.XlVAlign.xlVAlignCenter;
//此处用来设置列的样式
cell++;
}
}
// 创建行,把数据视图记录输出到对应的Excel 单元格
for (int i = 2; i < TasksData.Tables[0].Rows.Count; i++)
{
for (int j = 1; j < TasksData.Tables[0].Columns.Count; j++)
{
ws.Cells[i, j] = TasksData.Tables[0].Rows[i][j].ToString();
// r = (Range)ws.Cells[i,j]; Range rg = (Range)ws.get_Range(ws.Cells[i, j], ws.Cells[i, j]);
rg.EntireColumn.ColumnWidth = 20;
// rg.Columns.AutoFit();
rg.NumberFormatLocal = "@";
} }
#endregion
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
//显示 Excel
excelApp.Visible = true;
} private void button5_Click(object sender, EventArgs e)
{
DataSet ds = Bind();
dataGridView1.DataSource = ds.Tables[0];
}
private DataSet Bind()
{
SqlConnection conn = new SqlConnection("Server=.;Database=testManage;Integrated Security=SSPI");
SqlDataAdapter da = new SqlDataAdapter("select FNumber,FExamNum,FName,FSex,FJobAdd,FCardID,FBirDate from stuInfo", conn);
DataSet ds = new DataSet();
da.Fill(ds);
return ds;
}
private void button2_Click(object sender, EventArgs e)
{
SaveFileDialog sfd = new SaveFileDialog();
sfd.Title = "请选择将导出的EXCEL文件存放路径";
sfd.FileName = System.DateTime.Now.ToShortDateString() + "-学生信息";
sfd.Filter = "Excel文档(*.xls)|*.xls";
sfd.ShowDialog();
if (sfd.FileName != "")
{
Microsoft.Office.Interop.Excel.Application excelApp = new Microsoft.Office.Interop.Excel.Application();
if (excelApp == null)
{
MessageBox.Show("无法创建Excel对象,可能您的机器未安装Excel");
}
else
{
Microsoft.Office.Interop.Excel.Workbooks workbooks = excelApp.Workbooks;
Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(XlWBATemplate.xlWBATWorksheet);
Microsoft.Office.Interop.Excel.Worksheet worksheet =(Worksheet) workbook.Worksheets[1];
DataSet ds=Bind();
for (int i = 1; i < ds.Tables[0].Rows.Count; i++)
{
for (int j = 1; j < ds.Tables[0].Columns.Count;j++ )
{
if (i == 1)
{
worksheet.Cells[i, j] = dataGridView1.Columns[j].HeaderText;
}
worksheet.Cells[i+1, j] = ds.Tables[0].Rows[i][j].ToString();
}
}
//保存方式一:保存WorkBook
//workbook.SaveAs(@"F:\CData.xls",
// Missing.Value,Missing.Value,Missing.Value,Missing.Value,Missing.Value,
// Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange,Missing.Value,Missing.Value,Missing.Value,
// Missing.Value,Missing.Value); //保存方式二:保存WorkSheet
// worksheet.SaveAs(@"F:\CData2.xls",
// Missing.Value, Missing.Value, Missing.Value, Missing.Value,
// Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value); ////保存方式三
//workbook.Saved = true;
//workbook.SaveCopyAs(sfd.FileName);
System.Runtime.InteropServices.Marshal.ReleaseComObject(worksheet);
worksheet = null;
System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);
workbook = null;
workbooks.Close();
System.Runtime.InteropServices.Marshal.ReleaseComObject(workbooks);
workbooks = null;
excelApp.Quit();
System.Runtime.InteropServices.Marshal.ReleaseComObject(excelApp);
excelApp = null;
MessageBox.Show("导出Excel完成!");
}
}