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本篇內容主要講解“asp.net圖片上傳的方法教程”，感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷，實用性強。下面就讓小編來帶大家學習“asp.net圖片上傳的方法教程”吧!
第一、圖片上傳，代碼如下：
xxx.aspx
復制代碼 代碼如下:
<td class="style1">
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="上傳一般圖片" onclick="Button1_Click" />
</td>
<td class="style3">
<asp:Image ID="Image1" runat="server" Height="200px" Width="200px" />
</td>
xxx.aspx.cs
復制代碼 代碼如下:
protected void Button1_Click(object sender, EventArgs e)
{
for (int i = 0; i < Request.Files.Count; i++)
{
HttpPostedFile file = Request.Files[i];
if (file.ContentLength > 0)
{
if (file.ContentType.Contains("image/"))
{
using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream))
{
string FileName = System.IO.Path.GetFileName(file.FileName);
string[] SplitFileName = FileName.Split('.');
string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss")+"." + SplitFileName[1];
img.Save(Server.MapPath("/upload/" + AtterFileName));
this.Image1.ImageUrl = "upload/" + AtterFileName;
}
}
else
{
Response.Write("<script>alert('該文件不是圖片格式！');</script>");
}
}
else
{
Response.Write("<script>alert('請選擇要上傳的圖片');</script>");
}
}
}
第二、添加文字水印的圖片上傳，代碼如下：
xxx.aspx
復制代碼 代碼如下:
<td class="style1">
<asp:FileUpload ID="FileUpload2" runat="server" />
<asp:Button ID="Button2" runat="server" Text="上傳文字圖片" onclick="Button2_Click" />
</td>
<td>
<asp:Image ID="Image2" runat="server" Height="200px" Width="200px" />
</td>
xxx.aspx.cs
復制代碼 代碼如下:
protected void Button2_Click(object sender, EventArgs e)
{
for (int i = 0; i < Request.Files.Count; i++)
{
HttpPostedFile file = Request.Files[i];
if (file.ContentLength > 0)
{
if (file.ContentType.Contains("image/"))
{
using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream))
{
using (Graphics g = Graphics.FromImage(img))
{
g.DrawString("我的圖片", new Font("宋體", 14), Brushes.Red, 0, 0);
}
string FileName = System.IO.Path.GetFileName(file.FileName);
string[] SplitFileName = FileName.Split('.');
string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss") + "." + SplitFileName[1];
img.Save(Server.MapPath("/upload/" + AtterFileName));
this.Image2.ImageUrl = "upload/" + AtterFileName;
}
}
else
{
Response.Write("<script>alert('該文件不是圖片格式！');</script>");
}
}
else
{
Response.Write("<script>alert('請選擇要上傳的圖片');</script>");
}
}
}
第三、添加圖片水印的圖片上傳，代碼如下：
xxx.aspx
復制代碼 代碼如下:
<td class="style1">
<asp:FileUpload ID="FileUpload3" runat="server" />
<asp:Button ID="Button3" runat="server" Text="上傳水印圖片" onclick="Button3_Click" />
</td>
<td>
<asp:Image ID="Image3" runat="server" Height="200px" Width="200px" />
</td>
xxx.aspx.cs
復制代碼 代碼如下:
protected void Button3_Click(object sender, EventArgs e)
{
for (int i = 0; i < Request.Files.Count; i++)
{
HttpPostedFile file = Request.Files[i];
if (file.ContentLength > 0)
{
if (file.ContentType.Contains("image/"))
{
string fileName = file.FileName;
using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream))
{
using (System.Drawing.Image imgWater = System.Drawing.Image.FromFile(Server.MapPath("/img/czlogo.jpg")))
{
using (Graphics g = Graphics.FromImage(img))
{
g.DrawImage(imgWater, 0, 0);
}
string[] SplitFileName = fileName.Split('.');
string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss") + "." + SplitFileName[1];
img.Save(Server.MapPath("/upload/" + AtterFileName));
this.Image3.ImageUrl = "upload/" + AtterFileName;
}
}
}
else
{
Response.Write("<script>alert('該文件不是圖片格式！');</script>");
}
}
else
{
Response.Write("<script>alert('請選擇要上傳的圖片');</script>");
}
}
}
第四、上傳圖片濃縮圖，代碼如下：
xxx.aspx
復制代碼 代碼如下:
<td class="style1">
<asp:FileUpload ID="FileUpload4" runat="server" />
<asp:Button ID="Button4" runat="server" Text="上傳濃縮圖片" onclick="Button4_Click" />
</td>
<td>
<asp:Image ID="Image4" runat="server" Height="200px" Width="200px" />
</td>
xxx.aspx.cs
復制代碼 代碼如下:
protected void Button4_Click(object sender, EventArgs e)
{
for (int i = 0; i < Request.Files.Count; i++)
{
HttpPostedFile file = Request.Files[i];
if (file.ContentLength > 0)
{
if (file.ContentType.Contains("image/"))
{
using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream))
{
using (System.Drawing.Image imgThumb = new Bitmap(200, 100))
{
using (Graphics g = Graphics.FromImage(imgThumb))
{
g.DrawImage(img, new Rectangle(0, 0, imgThumb.Width, imgThumb.Height), new Rectangle(0, 0, img.Width, img.Height), GraphicsUnit.Pixel);
}
string fileName = file.FileName;
string[] SplitFileName = fileName.Split('.');
string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss") + "." + SplitFileName[1];
img.Save(Server.MapPath("/upload/" + AtterFileName));
this.Image4.ImageUrl = "upload/" + AtterFileName;
}
}
}
else
{
Response.Write("<script>alert('該文件不是圖片格式！');</script>");
}
}
else
{
Response.Write("<script>alert('請選擇要上傳的圖片');</script>");
}
}
}
到此，相信大家對“asp.net圖片上傳的方法教程”有了更深的了解，不妨來實際操作一番吧！這里是億速云網站，更多相關內容可以進入相關頻道進行查詢，關注我們，繼續學習！
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