Question

C#如何上传图片

在C#平台中，我想通过 单击 按钮“上传图片” 后从本地文件夹找一个图片传到 上面的pictureBox控件中。该如何实现。谢谢。最好有原代码。
如图：
我用的是winForm ，平台是：VS2005，希望高手们能帮助下，我该如何实现

Answer 1

C/S程序展示图片
C#上传图片很轻松，直接放个OpenFileDialog
上传按钮的点击事件：
openFileDialog1.ShowDialog();
pictureBox1.Image = Image.FromFile(openFileDialog1.FileName);

B/S程序上传图片:
C#上传图片很轻松，直接放个FileUpLoad

上传按钮的点击事件：
string file=FileUpload1.FileName;
FileUpload1.SaveAs(MapPath("~/images/"+file));

imgBook.ImageUrl = "~/images/" + file;

Answer 2

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
/// <summary>
/// 图片处理
/// </summary>
public class FilePath
{
public FilePath()
{
//
//TODO: 在此处添加构造函数逻辑
//
}
/**/
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
{
System.Drawing.Image originalImage = System.Drawing.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
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
//新建一个画板
System.Drawing.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(System.Drawing.Color.Transparent);
//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 System.Drawing.Rectangle(0, 0, towidth, toheight),
new System.Drawing.Rectangle(x, y, ow, oh),
System.Drawing.GraphicsUnit.Pixel);
try
{
//以jpg格式保存缩略图
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}

/**/
/// <summary>
/// 在图片上增加文字水印
/// </summary>
/// <param name="Path">原服务器图片路径</param>
/// <param name="Path_sy">生成的带文字水印的图片路径</param>
/// <param name="addText">水印文字内容</param>
/// <param name="Fontname">字体大小</param>
/// <param name="Draw">文字左边距离</param>
/// <param name="Drah">文字右边距离</param>
public static void AddWater(string Path, string Path_sy, string addText, int Fontname, int Draw, int Drah)
{
System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
g.DrawImage(image, 0, 0, image.Width, image.Height);
System.Drawing.Font f = new System.Drawing.Font("Verdana", Fontname);
System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Green);
g.DrawString(addText, f, b, 35, 35);
g.Dispose();
image.Save(Path_sy);
image.Dispose();
}
/**/
/// <summary>
/// 在图片上生成图片水印
/// </summary>
/// <param name="Path">原服务器图片路径</param>
/// <param name="Path_syp">生成的带图片水印的图片路径</param>
/// <param name="Path_sypf">水印图片路径</param>
public static void AddWaterPic(string Path, string Path_syp, string Path_sypf)
{
System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);
g.Dispose();
image.Save(Path_syp);
image.Dispose();
}
//// <summary>
/// 删除文件文件或图片
/// </summary>
/// <param name="path">当前文件的路径</param>
/// <returns>是否删除成功</returns>
public static bool FilePicDelete(string path)
{
bool ret = false;
System.IO.FileInfo file = new System.IO.FileInfo(path);
if (file.Exists)
{
file.Delete();
ret = true;
}
return ret;
}
}

Answer 3

this.pictureBox.BackgroundImage = Bitmap.FromFile(图片路径);

Answer 4

openfiledialog

Answer 5

呵呵 晚上给写 没带着...