C# 操作PPt，去掉文本框的边框

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;



using OFFICECORE = Microsoft.Office.Core;
using POWERPOINT = Microsoft.Office.Interop.PowerPoint;
using System.Windows;
using System.Collections;
using System.Windows.Forms;
using System.IO;

using System.ComponentModel;
using System.Data;
using System.Drawing;




namespace pptWrite
{

    /// <summary>
    /// PPT文档操作实现类.
    /// </summary>
    public class OperatePPT
    {
        #region=========基本的参数信息=======
        POWERPOINT.Application objApp = null;
        POWERPOINT.Presentation objPresSet = null;
        POWERPOINT.SlideShowWindows objSSWs;
        POWERPOINT.SlideShowTransition objSST;
        POWERPOINT.SlideShowSettings objSSS;
        POWERPOINT.SlideRange objSldRng;
        bool bAssistantOn;

        #endregion
        #region===========操作方法==============
        /// <summary>
        /// 打开PPT文档并播放显示。
        /// </summary>
        /// <param name="filePath">PPT文件路径</param>
        public void PPTOpen(string filePath)
        {
            //防止连续打开多个PPT程序.
            if (this.objApp != null) { return; }
            try
            {
                objApp = new POWERPOINT.Application();
                objApp.Visible = OFFICECORE.MsoTriState.msoTrue;

                //以非只读方式打开,方便操作结束后保存.
                objPresSet = objApp.Presentations.Open(filePath, OFFICECORE.MsoTriState.msoFalse);

            }
            catch (Exception ex)
            {
                MessageBox.Show("错误:" + ex.Message.ToString());
                this.objApp.Quit();

            }
        }
        /// <summary>
        /// 自动播放PPT文档.
        /// </summary>
        /// <param name="filePath">PPTy文件路径.</param>
        /// <param name="playTime">翻页的时间间隔.【以秒为单位】</param>
        public void PPTAuto(string filePath, int playTime)
        {
            //防止连续打开多个PPT程序.
            if (this.objApp != null) { return; }
            objApp = new POWERPOINT.Application();
            objPresSet = objApp.Presentations.Open(filePath, OFFICECORE.MsoTriState.msoCTrue, OFFICECORE.MsoTriState.msoFalse, OFFICECORE.MsoTriState.msoFalse);
            // 自动播放的代码（开始）
            int Slides = objPresSet.Slides.Count;
            int[] SlideIdx = new int[Slides];
            for (int i = 0; i < Slides; i++) { SlideIdx[i] = i + 1; };
            objSldRng = objPresSet.Slides.Range(SlideIdx);
            objSST = objSldRng.SlideShowTransition;
            //设置翻页的时间.
            objSST.AdvanceOnTime = OFFICECORE.MsoTriState.msoCTrue;
            objSST.AdvanceTime = playTime;
            //翻页时的特效!
            objSST.EntryEffect = POWERPOINT.PpEntryEffect.ppEffectCircleOut;
            //Prevent Office Assistant from displaying alert messages:
            bAssistantOn = objApp.Assistant.On;
            objApp.Assistant.On = false;
            //Run the Slide show from slides 1 thru 3.
            objSSS = objPresSet.SlideShowSettings;
            objSSS.StartingSlide = 1;
            objSSS.EndingSlide = Slides;
            objSSS.Run();
            //Wait for the slide show to end.
            objSSWs = objApp.SlideShowWindows;
            while (objSSWs.Count >= 1) System.Threading.Thread.Sleep(playTime * 100);
            this.objPresSet.Close();
            this.objApp.Quit();
        }
        /// <summary>
        /// PPT下一页。
        /// </summary>
        public void NextSlide()
        {
            if (this.objApp != null)
                try
                {
                    this.objPresSet.SlideShowWindow.View.Next();
                }
                catch
                { }
        }
        /// <summary>
        /// PPT上一页。
        /// </summary>
        public void PreviousSlide()
        {
            if (this.objApp != null)
                this.objPresSet.SlideShowWindow.View.Previous();
        }

        private int PageNum()
        {
            return objPresSet.Slides.Count;
 
        }

        public void SetLine()
        {
            int num = PageNum();
            for (int i = 0; i < num; i++)
            {
                if (i > 2)
                {
                    objSldRng= objPresSet.Slides.Range(i);
                    objSldRng.Select();
                    try
                    {
                        objSldRng.Application.ActiveWindow.Selection.SlideRange.Shapes.SelectAll();
                        objSldRng.Application.ActiveWindow.Selection.ShapeRange.Line.Visible = OFFICECORE.MsoTriState.msoFalse;
                    }
                    catch
                    { }
                    //MessageBox.Show("" + i.ToString());


                    //NextSlide();
                }

            }

        }


        /// <summary>
        /// 关闭PPT文档。
        /// </summary>
        public void PPTClose()
        {
            //装备PPT程序。
            if (this.objPresSet != null)
            {
                //判断是否退出程序,可以不使用。
                //objSSWs = objApp.SlideShowWindows;
                //if (objSSWs.Count >= 1)
                //{
                //if (MessageBox.Show("是否保存修改的笔迹!", "提示", MessageBoxButtons.OKCancel) == DialogResult.OK)
                this.objPresSet.Save();
                //}
                //this.objPresSet.Close();
            }
            if (this.objApp != null)
                this.objApp.Quit();
            GC.Collect();
        }
        #endregion
    }
}

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;

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

        private void button1_Click(object sender, EventArgs e)
        {
            ylbasicpub.YLCover.selectfilename(this.textBox1, "*.ppt|*.ppt");
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            ylbasicpub.YLCover.loadXml(this);
        }

        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            ylbasicpub.YLCover.SaveXml(this);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            OperatePPT pOperatePPT = new OperatePPT();
            pOperatePPT.PPTOpen(this.textBox1.Text);
            pOperatePPT.SetLine();
            //pOperatePPT.PPTClose();
            
        }
    }
}