图片与Json(String)的转换

 1         //图片 转为    base64编码的文本
 2         private void ImgToBase64String(string Imagefilename)
 3         {
 4             try
 5             {
 6                 MemoryStream ms = new MemoryStream(this.FileUpload1.FileBytes);
 7                 byte[] arr = new byte[ms.Length];
 8                 ms.Position = 0;
 9                 ms.Read(arr, 0, (int)ms.Length);
10                 ms.Close();
11                 String strbaser64 = Convert.ToBase64String(arr);
12                 this.TextBox1.Text = strbaser64;
13             }
14             catch (Exception ex)
15             {
16                 lbl_message.Text = "ImgToBase64String 转换失败\nException:" + ex.Message;
17             }
18         }

 1 <script type="text/javascript">
 2         function imgfun()
 3         {
 4             var result = $("#TextBox1").val();
 5             if (result.indexOf("<img",0) < 0)
 6             {
 7                 $("#TextBox1").val('<img src="data:image/bmp;base64,' + result + '" alt="图片Base64编码" style="max-width:90%; max-height:2000px;"/>');
 8             }
 9             $("#img_area").html('' + $("#TextBox1").val() + '');
10         }
11     </script>

 1 <div>
 2 
 3             <asp:FileUpload ID="FileUpload1" runat="server" Width="403px" />
 4             <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
 5             <input type="button" id="btn2" onclick="imgfun()" value="Button" />
 6 
 7         </div>
 8         <div>
 9             <asp:Label ID="lbl_message" runat="server" Text=""></asp:Label>
10         </div>
11         <div>
12             <input type="image" id="input_img" runat="server" /></div>
13         <div>
14             <asp:TextBox ID="TextBox1" runat="server" Height="200px" TextMode="MultiLine" Width="100%"></asp:TextBox></div>
15         <div>
16              <p id="img_area">  </p>
17 
18         </div>