利用Oledb操作XLS文件



利用Oledb操作XLS文件

简介：

解决方案：

Form1.designer.cs:

namespace XlsViaOledb
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.dataGridView1 = new System.Windows.Forms.DataGridView();
            this.comboBox1 = new System.Windows.Forms.ComboBox();
            this.label1 = new System.Windows.Forms.Label();
            this.button1 = new System.Windows.Forms.Button();
            this.toolTip1 = new System.Windows.Forms.ToolTip(this.components);
            ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
            this.SuspendLayout();
            // 
            // dataGridView1
            // 
            this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            this.dataGridView1.Location = new System.Drawing.Point(12, 34);
            this.dataGridView1.Name = "dataGridView1";
            this.dataGridView1.ShowCellToolTips = false;
            this.dataGridView1.Size = new System.Drawing.Size(504, 233);
            this.dataGridView1.TabIndex = 0;
            this.dataGridView1.DataError += new System.Windows.Forms.DataGridViewDataErrorEventHandler(this.dataGridView1_DataError);
            this.dataGridView1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.dataGridView1_MouseDown);
            // 
            // comboBox1
            // 
            this.comboBox1.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
            this.comboBox1.FormattingEnabled = true;
            this.comboBox1.Location = new System.Drawing.Point(113, 9);
            this.comboBox1.Name = "comboBox1";
            this.comboBox1.Size = new System.Drawing.Size(130, 20);
            this.comboBox1.TabIndex = 1;
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(12, 12);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(95, 12);
            this.label1.TabIndex = 2;
            this.label1.Text = "Select a sheet:";
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(290, 9);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 21);
            this.button1.TabIndex = 3;
            this.button1.Text = "Show";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // toolTip1
            // 
            this.toolTip1.IsBalloon = true;
            this.toolTip1.UseAnimation = false;
            this.toolTip1.UseFading = false;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(528, 278);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.comboBox1);
            this.Controls.Add(this.dataGridView1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.FormClosed += new System.Windows.Forms.FormClosedEventHandler(this.Form1_FormClosed);
            this.Load += new System.EventHandler(this.Form1_Load);
            ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.DataGridView dataGridView1;
        private System.Windows.Forms.ComboBox comboBox1;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.ToolTip toolTip1;
    }
}

Form.cs

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.OleDb;

namespace XlsViaOledb
{
    public partial class Form1 : Form
    {
        OleDbConnection conn;
        OleDbDataAdapter adapter;

        DataTable dt;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // connect to xls file
            // NOTE: it will be created if not exists
            conn = new OleDbConnection("Provider=Microsoft.Jet.OleDb.4.0;" +
                "Data Source=" + Application.StartupPath + "\\test.xls;" +
                "Extended Properties=Excel 8.0");
            conn.Open();

            // create a sheet "Sheet1" if not exists
            // NOTE: no "id" field needed
            // WARNING: spaces in sheet's name are supported if names are in [] (automatically replace with _)
            // spaces in column names NOT supported with OleDbCommandBuilder!
            try
            {
                string cmdText = "CREATE TABLE [Sheet 1] (text_col MEMO, int_col INT)";
                using (OleDbCommand cmd = new OleDbCommand(cmdText, conn))
                {
                    cmd.ExecuteNonQuery();
                }
            }
            catch { }

            // get sheets list into combobox
            dt = conn.GetSchema("Tables");
            for (int i = 0; i < dt.Rows.Count - 1; i++)
            {
                if (dt.Rows[i].ItemArray[dt.Columns.IndexOf("TABLE_TYPE")].ToString() == "TABLE" &&
                    !dt.Rows[i].ItemArray[dt.Columns.IndexOf("TABLE_NAME")].ToString().Contains("$"))
                {
                    comboBox1.Items.Add(dt.Rows[i].ItemArray[dt.Columns.IndexOf("TABLE_NAME")]);
                }
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            adapter = new OleDbDataAdapter("SELECT * FROM " + comboBox1.SelectedItem.ToString(), conn);

            new OleDbCommandBuilder(adapter);

            dt = new DataTable();
            adapter.Fill(dt);
            dataGridView1.DataSource = dt;
        }

        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            if (adapter == null) return;

            adapter.Update(dt);
        }

        // show tooltip (not intrusive MessageBox) when user trying to input letters into INT column cell
        private void dataGridView1_DataError(object sender, DataGridViewDataErrorEventArgs e)
        {
            if (dt.Columns[e.ColumnIndex].DataType == typeof(Double))
            {
                Rectangle rectColumn;
                rectColumn = dataGridView1.GetColumnDisplayRectangle(e.ColumnIndex, false);

                Rectangle rectRow;
                rectRow = dataGridView1.GetRowDisplayRectangle(e.RowIndex, false);

                toolTip1.ToolTipTitle = "This field is for integers and decimals only.";
                toolTip1.Show(" ",
                          dataGridView1,
                          rectColumn.Left, rectRow.Top + rectRow.Height);
            }
        }

        private void dataGridView1_MouseDown(object sender, MouseEventArgs e)
        {
            toolTip1.Hide(dataGridView1);
        }
    }
}

利用Oledb操作Xlsx文件