asp.net 庶罩层上传图片(二进制),并显示二进制图片-优快云博客

1.上传功能

JS检查 function hideUpImg()//关闭层，并上传图片 { var v=document.getElementById("upImg").value; var after=v.substring(v.lastIndexOf('.')).toLowerCase(); alert(after); if(v.length<=0) { alert("请选择图片"); return false; } if(after==".jpg"||after==".gif"||after==".png") { return true; } alert("图片只能是.jpg .gif .png格式"); document.getElementById("upImg").outerHTML=document.getElementById("upImg").outerHTML; return false; } 页面代码： <div id="myDiv" style="display: none;" mce_style="display: none;" class="divshowbottom"> </div> <div id="upLoadImg" style="top: 200px;left: 300px;display: none;" class="divshowwork"> <div style="width: 100%; height: 20px;background-color: #FF0000; cursor: move;">上传图片</div> <p style="text-align: center;" mce_style="text-align: center;">请上传图片</p> <asp:FileUpload ID="upImg" runat="server" /> <asp:Label ID="lblState" runat="server" ></asp:Label> <br /><asp:Button ID="btnUpImg" runat="server" Text="上传" OnClick="btnUpImg_Click" /> <input type="button" value="取消" id="button_2" /> </div> 后台代码: Stream stream = this.upImg.PostedFile.InputStream; byte[] photo = new byte[upImg.PostedFile.ContentLength]; stream.Read(photo, 0, upImg.PostedFile.ContentLength); ItemMaster im = new ItemMaster(); im.ItemUid =Convert.ToInt32(s.Split('|')[1]); im.Drawing = photo; int upd = ItemMasterBIZ.UpdItemMasterByImg(im); stream.Close();

2.显示二进制图片

源页面代码：a.aspx 后台代码为： img.ImageUrl = "b.aspx?ImgID=" + 1; 显示图片页面 b.aspx 后台代码： object s = Request.QueryString["ImgID"]; //; if (s != null) { string connectionString = ConfigurationSettings.AppSettings["SQLConnectionStr"]; using (SqlConnection myConnection = new SqlConnection(connectionString)) { SqlCommand myCommand = new SqlCommand("Select drawing from DAT_ITEM_master Where item_uid=" + s.ToString(), myConnection); try { myConnection.Open(); SqlDataReader myDataReader; myDataReader = myCommand.ExecuteReader(); if (myDataReader.Read()) { if (myDataReader["drawing"] is DBNull) return; Response.Clear(); Response.ContentType = "application/octet-stream"; Response.BinaryWrite((byte[])myDataReader["drawing"]); } } catch (SqlException SQLexc) { Response.Write(SQLexc.ToString()); } } } }

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