imageupload.cs

c#常用类库大全

    {
        get { return _Height; }
    }

    /// <summary>
    /// 设置缩略图的宽度
    /// </summary>
    public int sWidth
    {
        get { return _sWidth; }
        set { _sWidth = value; }
    }

    /// <summary>
    /// 设置缩略图的高度
    /// </summary>
    public int sHeight
    {
        get { return _sHeight; }
        set { _sHeight = value; }
    }

    /// <summary>
    /// 是否生成缩略图
    /// </summary>
    public bool IsCreateImg
    {
        get { return _IsCreateImg; }
        set { _IsCreateImg = value; }
    }

    /// <summary>
    /// 是否加水印
    /// </summary>
    public bool IsDraw
    {
        get { return _IsDraw; }
        set { _IsDraw = value; }
    }

    /// <summary>
    /// 设置加水印的方式
    /// 0:文字水印模式
    /// 1:图片水印模式
    /// 2:不加
    /// </summary>
    public int DrawStyle
    {
        get { return _DrawStyle; }
        set { _DrawStyle = value; }
    }

    /// <summary>
    /// 绘制文本的Ｘ坐标（左上角）
    /// </summary>
    public int DrawString_x
    {
        get { return _DrawString_x; }
        set { _DrawString_x = value; }
    }

    /// <summary>
    /// 绘制文本的Ｙ坐标（左上角）
    /// </summary>
    public int DrawString_y
    {
        get { return _DrawString_y; }
        set { _DrawString_y = value; }
    }

    /// <summary>
    /// 设置文字水印内容
    /// </summary>
    public string AddText
    {
        get { return _AddText; }
        set { _AddText = value; }
    }

    /// <summary>
    /// 设置文字水印字体
    /// </summary>
    public string Font
    {
        get { return _Font; }
        set { _Font = value; }
    }

    /// <summary>
    /// 设置文字水印字的大小
    /// </summary>
    public int FontSize
    {
        get { return _FontSize; }
        set { _FontSize = value; }
    }

    /// <summary>
    /// 文件大小
    /// </summary>
    public int FileSize
    {
        get { return _FileSize; }
        set { _FileSize = value; }
    }

    /// <summary>
    /// 图片水印模式下的覆盖图片的实际地址
    /// </summary>
    public string CopyIamgePath
    {
        set { _CopyIamgePath = System.Web.HttpContext.Current.Server.MapPath(value); }
    }

    #endregion

    #region 私有方法
    /// <summary>
    /// 获取文件的后缀名 
    /// </summary>
    private string GetExt(string path)
    {
        return Path.GetExtension(path);
    }

    /// <summary>
    /// 获取输出文件的文件名
    /// </summary>
    private string FileName(string Ext)
    {
        if (_SaveType == 0 || _InFileName.Trim() == "")
            return DateTime.Now.ToString("yyyyMMddHHmmssfff") + Ext;
        else
            return _InFileName;
    }

    /// <summary>
    /// 检查上传的文件的类型，是否允许上传。
    /// </summary>
    private bool IsUpload(string Ext)
    {
        Ext = Ext.Replace(".", "");
        bool b = false;
        string[] arrFileType = _FileType.Split(';');
        foreach (string str in arrFileType)
        {
            if (str.ToLower() == Ext.ToLower())
            {
                b = true;
                break;
            }
        }
        return b;
    }
    #endregion

    #region 上传图片
    public void Upload()
    {
        HttpPostedFile hpFile = _FormFile.PostedFile;
        if (hpFile == null || hpFile.FileName.Trim() == "")
        {
            _Error = 1;
            return;
        }
        string Ext = GetExt(hpFile.FileName);
        if (!IsUpload(Ext))
        {
            _Error = 2;
            return;
        }
        int iLen = hpFile.ContentLength;
        if (iLen > _MaxSize)
        {
            _Error = 3;
            return;
        }
        try
        {
            if (!Directory.Exists(_SavePath)) Directory.CreateDirectory(_SavePath);
            byte[] bData = new byte[iLen];
            hpFile.InputStream.Read(bData, 0, iLen);
            string FName;
            FName = FileName(Ext);
            string TempFile = "";
            if (_IsDraw)
            {
                TempFile = FName.Split('.').GetValue(0).ToString() + "_temp." + FName.Split('.').GetValue(1).ToString();
            }
            else
            {
                TempFile = FName;
            }
            FileStream newFile = new FileStream(_SavePath + TempFile, FileMode.Create);
            newFile.Write(bData, 0, bData.Length);
            newFile.Flush();
            int _FileSizeTemp = hpFile.ContentLength;

            string ImageFilePath = _SavePath + FName;
            if (_IsDraw)
            {
                if (_DrawStyle == 0)
                {
                    System.Drawing.Image Img1 = System.Drawing.Image.FromStream(newFile);
                    Graphics g = Graphics.FromImage(Img1);
                    g.DrawImage(Img1, 100, 100, Img1.Width, Img1.Height);
                    Font f = new Font(_Font, _FontSize);
                    Brush b = new SolidBrush(Color.Red);
                    string addtext = _AddText;
                    g.DrawString(addtext, f, b, _DrawString_x, _DrawString_y);
                    g.Dispose();
                    Img1.Save(ImageFilePath);
                    Img1.Dispose();
                }
                else
                {
                    System.Drawing.Image image = System.Drawing.Image.FromStream(newFile);
                    System.Drawing.Image copyImage = System.Drawing.Image.FromFile(_CopyIamgePath);
                    Graphics g = Graphics.FromImage(image);
                    g.DrawImage(copyImage, new Rectangle(image.Width - copyImage.Width - 5, image.Height - copyImage.Height - 5, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
                    g.Dispose();
                    image.Save(ImageFilePath);
                    image.Dispose();
                }
            }

            //获取图片的高度和宽度
            System.Drawing.Image Img = System.Drawing.Image.FromStream(newFile);
            _Width = Img.Width;
            _Height = Img.Height;

            //生成缩略图部分 
            if (_IsCreateImg)
            {
                #region 缩略图大小只设置了最大范围，并不是实际大小
                float realbili = (float)_Width / (float)_Height;
                float wishbili = (float)_sWidth / (float)_sHeight;

                //实际图比缩略图最大尺寸更宽矮，以宽为准
                if (realbili > wishbili)
                {
                    _sHeight = (int)((float)_sWidth / realbili);
                }
                //实际图比缩略图最大尺寸更高长，以高为准
                else
                {
                    _sWidth = (int)((float)_sHeight * realbili);
                }
                #endregion

                this.OutThumbFileName = FName.Split('.').GetValue(0).ToString() + "_s." + FName.Split('.').GetValue(1).ToString();
                string ImgFilePath = _SavePath + this.OutThumbFileName;

                System.Drawing.Image newImg = Img.GetThumbnailImage(_sWidth, _sHeight, null, System.IntPtr.Zero);
                newImg.Save(ImgFilePath);
                newImg.Dispose();
                _Iss = true;
            }

            if (_IsDraw)
            {
                if (File.Exists(_SavePath + FName.Split('.').GetValue(0).ToString() + "_temp." + FName.Split('.').GetValue(1).ToString()))
                {
                    newFile.Dispose();
                    File.Delete(_SavePath + FName.Split('.').GetValue(0).ToString() + "_temp." + FName.Split('.').GetValue(1).ToString());
                }
            }
            newFile.Close();
            newFile.Dispose();
            _OutFileName = FName;
            _FileSize = _FileSizeTemp;
            _Error = 0;
            return;
        }
        catch (Exception ex)
        {
            _Error = 4;
            return;
        }
    }
    #endregion
}