C#摘记一

C#实现将图片黏贴到RichBox中

 Bitmap bmp = new Bitmap(cache_file);
 //Bitmap bmp = new Bitmap(@"C:\Users\Administrator\Desktop\temp\BBGJ.png");//获得图片
  //Bitmap bmp = new Bitmap(@"https://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png");//https路径不支持
   Clipboard.SetDataObject(bmp, false);//将图片放在剪贴板中
  if (rich_conter.CanPaste(DataFormats.GetFormat(DataFormats.Bitmap)))
   rich_conter.Paste();//粘贴数据
 // rich_conter.AddFile(cache_file);

C#中自适应添加图片

   PictureBox receive_pic = new PictureBox();
    receive_pic.SizeMode = PictureBoxSizeMode.StretchImage;//图片适应PicBox大小
    receive_pic.Size = new Size(Linewidth, Lineheight);
    receive_pic.Image = Image.FromFile(download_file);
    Image receive_image = receive_pic.Image;
    receive_pic.Image = receive_image;

保存文件

  private void bt_save_Click(object sender, EventArgs e)
        {
            Image image = this.pic_MaxImage.Image;
            //用户自由选择指定路径保存文件
            SaveFileDialog savedialog = new SaveFileDialog();
            savedialog.FileName = "保存图片";
            savedialog.Filter = "Png 图片|*.png|Jpg 图片|*.jpg|Bmp 图片|*.bmp|Gif 图片|*.gif";
            savedialog.FilterIndex = 0;        
            savedialog.RestoreDirectory = true;//保存对话框是否记忆上次打开的目录
            savedialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);//初始默认目录，桌面
            savedialog.CheckPathExists = true;//检查目录
            savedialog.FileName = "图片_" + DateTime.Now.ToString("yyyyMMddHHmmssfff");//设置默认文件名
            if (savedialog.ShowDialog() == DialogResult.OK)
            {
                image.Save(savedialog.FileName);// image为要保存的图片
                MessageBox.Show(this, "图片保存成功！", "提示");
            }
        }

点击PictureBox放大图片

//鼠标点击事件
private void rich_conter_MouseClick(object sender, MouseEventArgs e)
 {
       FrmViewImages fvi = new FrmViewImages();
      //fvi.AutoSize = true;  
       fvi.StartPosition = FormStartPosition.CenterScreen;
       fvi.pictureBox_MaxView(sender,e);
       fvi.Show();
 }
//在另外的一个窗体中显示
public void pictureBox_MaxView(object sender, MouseEventArgs e)
        {
            this.pic_MaxImage.Anchor = AnchorStyles.None;
            this.pic_MaxImage.SizeMode = PictureBoxSizeMode.StretchImage;//自适应长宽
            PictureBox pic = (PictureBox)sender;
            var img = pic.Image.Clone();
            this.pic_MaxImage.Image = (Image)img;

            //图片控件的宽高
            double w = this.pic_MaxImage.Size.Width;
            double h = this.pic_MaxImage.Size.Height;

            //图片的宽高
            int imageWidth = this.pic_MaxImage.Image.Size.Width;
            int imageHeight = this.pic_MaxImage.Image.Size.Height;

            //根据Images的大小设置picBox的大小
            if (imageHeight <300 || imageWidth < 300)
            {
                //放大1.2倍数
                this.pic_MaxImage.Height = (int)(imageHeight * 1.2);
                this.pic_MaxImage.Width = (int)(imageWidth * 1.2);
            }
            else
            {
                //等比例
                this.pic_MaxImage.Height = imageHeight;
                this.pic_MaxImage.Width = imageWidth;
            }        

            //设置窗体大小
            this.pic_MaxImage.Parent.Height = this.pic_MaxImage.Height + 100;
            this.pic_MaxImage.Parent.Width = this.pic_MaxImage.Width + 80;


            //设置图片位置
            int x = pic_MaxImage.Parent.Location.X + (pic_MaxImage.Parent.Width - pic_MaxImage.Width) / 2;
            int y = pic_MaxImage.Parent.Location.Y + (pic_MaxImage.Parent.Height - pic_MaxImage.Height) / 2;
            this.pic_MaxImage.Location = new System.Drawing.Point(x, y);
        }

控件在父窗体中居中

   public static bool CenterCtr(Control ctr, bool isLR, bool isUD)
        {
            Control pCtr = ctr.Parent;
            int x = isLR ? ((pCtr.Width - ctr.Width) / 2) : ctr.Location.X;
            int y = isUD ? ((pCtr.Height - ctr.Height) / 2) : ctr.Location.Y;
            ctr.Location = new System.Drawing.Point(x , y );
            return true;
        }

调用等待窗口

  using (FrmWait w = new FrmWait())
  {
     ((Action)(delegate ()
       {
           	//默认处理CRUD
               Thread.Sleep(2500);
        }
     )).BeginInvoke(new AsyncCallback((IAsyncResult ar) => (ar.AsyncState as FrmWait).DialogResult = DialogResult.OK), w);
     w.StartPosition = FormStartPosition.CenterParent;
     w.ShowDialog();
   }

字符串转rtf值

//字符串转rtf
        public string str2Rtf(string s)
        {
            string rtfFormattedString = "";
            RichTextBox richTextBox = new RichTextBox();
            richTextBox.Text = s;
            rtfFormattedString = richTextBox.Rtf;
            return rtfFormattedString;
        }

生成缩略图

    public static bool MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
        {
            bool f = false;
            Image originalImage = Image.FromFile(originalImagePath);

            int towidth = width;
            int toheight = height;

            int x = 0;
            int y = 0;
            int ow = originalImage.Width;
            int oh = originalImage.Height;

            switch (mode)
            {
                case "HW"://指定高宽缩放（可能变形）                
                    break;
                case "W"://指定宽，高按比例                    
                    toheight = originalImage.Height * width / originalImage.Width;
                    break;
                case "H"://指定高，宽按比例
                    towidth = originalImage.Width * height / originalImage.Height;
                    break;
                case "Cut"://指定高宽裁减（不变形）                
                    if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
                    {
                        oh = originalImage.Height;
                        ow = originalImage.Height * towidth / toheight;
                        y = 0;
                        x = (originalImage.Width - ow) / 2;
                    }
                    else
                    {
                        ow = originalImage.Width;
                        oh = originalImage.Width * height / towidth;
                        x = 0;
                        y = (originalImage.Height - oh) / 2;
                    }
                    break;
                default:
                    break;
            }

            //新建一个bmp图片
            Image bitmap = new System.Drawing.Bitmap(towidth, toheight);

            //新建一个画板
            Graphics g = System.Drawing.Graphics.FromImage(bitmap);

            //设置高质量插值法
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

            //设置高质量,低速度呈现平滑程度
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            //清空画布并以透明背景色填充
            g.Clear(Color.White);

            //在指定位置并且按指定大小绘制原图片的指定部分
            g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
                new Rectangle(x, y, ow, oh),
                GraphicsUnit.Pixel);

            try
            {
                //以jpg格式保存缩略图
                bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
                f = true;
            }
            catch (System.Exception e)
            {
                f = false;
            }
            finally
            {
                originalImage.Dispose();
                bitmap.Dispose();
                g.Dispose();
            }
            return f;
        }

下载文件

    public static bool DownLoadFiles(string uri, string filefullpath, int size = 1024)
        {
            try
            {
                if (File.Exists(filefullpath))
                {
                    try
                    {
                        File.Delete(filefullpath);
                    }
                    catch (Exception ex)
                    {
                        return false;
                    }
                }
                string fileDirectory = System.IO.Path.GetDirectoryName(filefullpath);
                if (!Directory.Exists(fileDirectory))
                {
                    Directory.CreateDirectory(fileDirectory);
                }
                FileStream fs = new FileStream(filefullpath, FileMode.Create);
                byte[] buffer = new byte[size];
                HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
                request.Timeout = 10000;
                request.AddRange((int)fs.Length);

                Stream ns = request.GetResponse().GetResponseStream();

                long contentLength = request.GetResponse().ContentLength;

                int length = ns.Read(buffer, 0, buffer.Length);

                while (length > 0)
                {
                    fs.Write(buffer, 0, length);

                    buffer = new byte[size];

                    length = ns.Read(buffer, 0, buffer.Length);
                }
                fs.Close();
                return true;
            }
            catch (Exception ex)
            {
                return false;
            }
        }

打开文件

   private void selectFile()
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Filter = "Files|*.png;*.jpg";              // 设定打开的文件类型
            //openFileDialog.InitialDirectory = AppDomain.CurrentDomain.BaseDirectory;                       // 打开app对应的路径
            openFileDialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);  // 打开桌面

            // 如果选定了文件
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                // 取得文件路径及文件名
                filePath = openFileDialog.FileName;

                //Rich_Edit 中添加图片
                Bitmap bmp = new Bitmap(filePath);//获得图片
                Clipboard.SetDataObject(bmp, false);//将图片放在剪贴板中
                if (Rich_Edit.CanPaste(DataFormats.GetFormat(DataFormats.Bitmap)))
                    Rich_Edit.Paste();//粘贴数据

                //设置发照片flag
                is_sendImg = true;
            }

        }

回车键监听

      //Rich_Edit.KeyUp += new KeyEventHandler(Rich_Edit_Enter);
        //编辑框回车
        private void Rich_Edit_Enter(object sender, KeyEventArgs e)
        {
            //判断是否有回车键输入
            if (e.KeyCode == Keys.Control || e.KeyCode == Keys.Enter)
            {
                //处理事件
            }
        }

播放Mp3音频

 /// <summary>
        /// 播放音频,
        /// 1.添加新引用 COM组件的Microsoft Shell Controls And Automation
        /// 2.添加成功，引用中显示的为Shell32.dll，、
        /// 3.设置Shell32.dll的属性为嵌入互操作类型：FALSE
        /// </summary>
        IWavePlayer wavePlayer;
        AudioFileReader audioFileReader;
        private void Voice_MouseClick(object sender, MouseEventArgs e)
        {
            //通过tag取出音频文件路径
            RichTextBoxEx richBox = (RichTextBoxEx)sender;
            string vioce_file = richBox.Tag.ToString();

            Task.Factory.StartNew(() =>
            {
                wavePlayer = new WaveOut();
                audioFileReader = new AudioFileReader(vioce_file);
                wavePlayer.Init(audioFileReader);
                wavePlayer.Play();//播放
            });

        }

计算音频的时长

  /// <summary>
        /// 获取mp3文件的歌曲时间长度
        /// </summary>
        /// <param name="songPath"></param>
        /// <returns></returns>
        private string GetMp3Times(string songPath)
        {
            try
            {
                //完整路径
                songPath = System.Environment.CurrentDirectory + "\\" + songPath;
                string dirName = System.IO.Path.GetDirectoryName(songPath);
                string SongName = System.IO.Path.GetFileName(songPath);//获得歌曲名称  
                // FileInfo fInfo = new FileInfo(songPath);
                ShellClass sh = new ShellClass();
                Folder dir = sh.NameSpace(dirName);
                FolderItem item = dir.ParseName(SongName);
                string s = Regex.Match(dir.GetDetailsOf(item, -1), "\\d:\\d{2}:\\d{2}").Value;//获取歌曲时间

                //处理时间
                if (s.StartsWith("0:00"))
                {
                    s = s.Substring(s.Length - 2, 2);
                    if (s.StartsWith("0"))
                    {
                        s = s.Substring(1);
                    }
                }
              
                return s;
            }
            catch (Exception ex)
            {

                throw;
            }
           
        }

获取数据库链接字符串

 public class GetDefaultConnString
    {
        /// <summary>
        /// 默认连接字符串
        /// </summary>
        private readonly static string conn = @"Server=localhost\MSSQLSERVER2008;Initial Catalog=testdb;User ID=sa;Password=123456";

        /// <summary>
        /// 获取指定的连接字符串
        /// </summary>
        /// <param name="keyName"></param>
        /// <returns></returns>
        public static string GetConnectString(string keyName)
        {
            string str = ConfigurationManager.ConnectionStrings[keyName]==null?conn: ConfigurationManager.ConnectionStrings[keyName].ToString();
            return string.IsNullOrWhiteSpace(str) ? conn : str;
        }

    }