首页 / C# / C# 使用FileUpload控件上传图片，将文件转换成二进制进行存储与读取

C# 使用FileUpload控件上传图片，将文件转换成二进制进行存储与读取

内容导读

互联网集市收集整理的这篇技术教程文章主要介绍了C# 使用FileUpload控件上传图片，将文件转换成二进制进行存储与读取，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含11591字，纯文字阅读大概需要17分钟。

内容图文

状况描述：

　　需要上传文件，但是不想要保存到实体路径下，便可以用该功能来实现。

 

效果图：

技术分享

　　点击【Upload】按钮，上传文件到数据库；

　　点击【Preview】，预览文件；

 

具体实现：

　　前台：

技术分享 技术分享 
                 1 <tr>
 2   <td class="subject" nowrap="nowrap" align="right" style="width: 180px; text-align: right;"><%=Resources.WebResource.OE_ID_TYPE%>
 3       <!--ID Type-->
 4      :
 5   </td>
 6   <td style="color: #F90;">                                                 
 7       <asp:DropDownList ID="drpIDType_N" runat="server" style="width: 25%;" OnSelectedIndexChanged="drpIDType_N_SelectedIndexChanged" AutoPostBack="true"></asp:DropDownList>
 8       <span style="color: Red;">*</span>
 9       <asp:FileUpload ID="btnFile" runat="server" Style="width: 25%;" />
1011       <input type="button" id="btnUpload" runat="server" value=‘<%$ Resources:WebResource,CC_UPLOAD%>‘ onserverclick="btnUpload_Click" Visible="true"  style="height:inherit; text-align: center;color: #b44c00;font-weight: 700;background-color: #ffe926;"   />
12       <a href="Javascript: void(0)" id="lnkShowImg" runat="server" title="<%$ Resources:WebResource,IMG_PREVIEW_TITLE%>" visible="false" style="width:15%"><%=Resources.WebResource.IMG_PREVIEW%></a>       
13   </td>
14 </tr>
15 <tr>
16   <td class="subject" nowrap="nowrap" align="right" style="width: 180px; text-align: right;"><%=Resources.WebResource.OE_ID_NO%>
17       <!--ID No-->
18      :
19   </td>
20   <td class="name">
21       <input type="text" runat="server" id="txtIDNO_N" maxlength="50" style="width: 96.6%;" />
22       <span style="color: Red">*</span>
23   </td>
24 </tr>
View Code

 

　　后台：

技术分享 技术分享 
                  1
                protected
                void btnUpload_Click(object sender, EventArgs e)
  2{
  3try  4    {
  5         UploadImg(this.btnFile, this.txtEmployeeID, this.txtDEPID);
  6    }
  7catch (Exception ex)
  8    {
  9         ShowError("W99999", "J00006", o_PopupWin, this.mLanguage);
 10        WriteLog(ex.ToString());
 11         WriteLog("Browser:" + HttpContext.Current.Request.Browser.Browser);
 12    }
 13}
 14 15privatevoid UploadImg(FileUpload file, string s_EmployeeID, string s_DEPID)
 16{
 17//验证文件类型 18     Boolean fileOK = false;
 19    String fileExtension;
 20if (file.HasFile) //判断是否有图片上来了 21    {
 22         fileExtension = System.IO.Path.GetExtension(file.FileName.Trim()).ToLower();//获取文件扩展名 23         String[] allowedExtensions = { ".jpg", ".png", ".jpeg" }; //允许上传的文件格式 24for (int i = 0; i < allowedExtensions.Length; i++)
 25        {
 26if (fileExtension == allowedExtensions[i])
 27            {
 28                 fileOK = true;
 29break;
 30            }
 31        }
 32    }
 33else 34    {
 35         Response.Write("<script>alert(‘进行提示‘);</script>");
 36return;
 37    }
 38if (!fileOK)
 39    {
 40         Response.Write("<script>alert(‘进行提示‘);</script>");
 41return;
 42    }
 43 44#region 因浏览器兼容问题，会取不到文件完整路径，所以先将文件保存到本地
 45string strFileLocalPath = Server.MapPath("../../Upload//Tmp//");
 46string strFileName = strFileLocalPath + DateTime.Now.ToString("yyyyMMddHHmmss") + fileExtension;
 47if (Directory.Exists(strFileLocalPath) == false)
 48    {
 49        Directory.CreateDirectory(strFileLocalPath);
 50    }
 51if (file.PostedFile.FileName.Trim() != "")
 52    {
 53        file.PostedFile.SaveAs(strFileName);
 54         WriteLog("Browser:" + HttpContext.Current.Request.Browser.Browser);
 55    }
 56#endregion 57 58//将文件读进二进制内存 59byte[] photo = Utility.getImg(strFileName, true);
 60 61//插入数据库 62    o_CC_Insured_BLL.insertOrUpdateCCImg(fileExtension, System.IO.Path.GetFileName(file.PostedFile.FileName), photo);
 63 64//给【Preview】赋JS事件 65    setShowImgLink(s_EmployeeID, s_DEPID);
 66 67//提示上传成功 68     ShowOk("W00058", "J00005", o_PopupWin, this.mLanguage);
 69}
 70 71///<summary> 72/// 从数据库里面查询已上传的文件
 73///</summary> 74///<param name="filePath"></param> 75///<returns></returns> 76privatevoid setShowImgLink(string s_EmployeeID, string s_DEPID)
 77{
 78     DataTable dtimg = new DataTable();
 79 80     dtimg = o_CC_Insured_BLL.getUploadFileCC(s_EmployeeID, s_DEPID);
 81if (dtimg.Rows.Count > 0)
 82    {
 83         lnkShowImg.Attributes.Add("onclick", "funOpenShowImage(‘" + s_EmployeeID + "‘,‘" + s_DEPID + "‘);");
 84         lnkShowImg.Visible = true;
 85    }
 86else 87    {
 88         lnkShowImg.Visible = false;
 89    }
 90}
 91 92///<summary> 93/// 将图片文件写入二进制对象
 94///</summary> 95///<param name="filePath"></param> 96///<returns></returns> 97publicstaticbyte[] getImg(string filePath, bool deleteFlg)
 98{
 99//读取图片100     FileStream fs = new System.IO.FileStream(filePath, FileMode.Open, FileAccess.Read);
101     BinaryReader br = new BinaryReader(fs);
102byte[] photo;
103try104    {
105         photo = br.ReadBytes((int)fs.Length);
106    }
107finally108    {
109        br.Close();
110        fs.Close();
111    }
112//删除文件113if (deleteFlg)
114    {
115//删除图片文件116if (File.Exists(filePath))
117        {
118            File.Delete(filePath);
119        }
120    }
121return photo;
122 }
View Code

 

　　JS：

技术分享 技术分享 
                 1
                function funOpenShowImage(s_EmployeeID, s_DEPID) {

                 2
                var strUrl = "../showUploadImg.aspx";
 3if (document.all)//IE浏览器 4    {
 5var strParm = s_EmployeeID + "," + s_DEPID
 6         openNewWin_IE(strUrl, strParm, 850, 630, "newwin");
 7    }
 8elseif ((/Trident\/7\./).test(navigator.userAgent))//IE11浏览器 9    {
10var strParm = s_EmployeeID + "," + s_DEPID
11         openNewWin_IE11(strUrl, strParm, 850, 630, "newwin");
12    }
13else//其他浏览器14    {
15var aryParm = [["EmployeeID", s_EmployeeID], ["DEPID", s_DEPID]];
16         OpenNewWin(strUrl, aryParm, 850, 630, "newwin");
17    }
18 }
View Code

 

　　预览需要新建一个页面：

　　新建showUploadImg.aspx

　　前台：

　　添加Img控件

            1 <div>
2         <img runat="server" id="imgShow" src="\Upload\TMP\aaa.jpg" />
3 </div>

 

　　后台：

技术分享 技术分享 
                 1
                protected
                void Page_Load(object sender, EventArgs e)
 2{
 3try 4    {
 5         clearTmp(Server.MapPath("../Upload/TMP/"));
 6//setInsured();
 7//saveImg(); 8 9string _EmployeeID = string.Empty;
10string _DepID = string.Empty;
11string strParm = this.Request.Form.Get("param") == null ? "" : Server.HtmlDecode(this.Request.Form.Get("param"));
12if (string.IsNullOrEmpty(strParm))
13        {
14             _EmployeeID = this.Request.Form.Get("EmployeeID") == null ? "" : Server.HtmlDecode(this.Request.Form.Get("EmployeeID"));
15             _DepID = this.Request.Form.Get("DEPID") == null ? "" : Server.HtmlDecode(this.Request.Form.Get("DEPID"));
16        }
17else18        {
19string[] arrParm = strParm.Split(‘,‘);
20             _EmployeeID = arrParm[0] == null ? "" : arrParm[0];
21             _DepID = arrParm[1] == null ? "" : arrParm[1];
22        }
2324//从数据库读取文件25         DataTable dtImg = new DataTable();
26         dtImg = o_CC_Insured_Bll.getUploadFileCC(_EmployeeID, _DepID);
2728string strFileName = _EmployeeID + DateTime.Now.ToString("yyyyMMddhhmmss") + ".JPG";
29string strPhotoPath = "../Upload/TMP/";
30string strFullPhotoPath = Server.MapPath(strPhotoPath) + strFileName;
31if (dtImg.Rows.Count > 0 && dtImg.Rows[0]["ImgFile"] != DBNull.Value)
32        {
33if (Directory.Exists(Server.MapPath(strPhotoPath)) == false)
34            {
35                Directory.CreateDirectory(Server.MapPath(strPhotoPath));
36            }
37string setImgResult = setImg((byte[])dtImg.Rows[0]["ImgFile"], strFullPhotoPath);
38if (string.IsNullOrEmpty(setImgResult))
39            {
40                 imgShow.Src = strPhotoPath + strFileName;
41            }
42        }
43    }
44catch45    {
46         ShowError("W99999", "J00006", o_PopupWin, this.mLanguage);
47    }
48}
495051///<summary>52/// 清空文件夹下的内容
53///</summary>54///<param name="folderPath"></param>55publicstaticvoid clearTmp(string folderPath)
56{
57//判斷是否有這樣的路徑58if (System.IO.Directory.Exists(folderPath) == true)
59    {
60         DirectoryInfo theFolder = new DirectoryInfo(folderPath);
61         FileInfo[] fileInfo = theFolder.GetFiles();
62foreach (FileInfo NextFile in fileInfo)  //遍历文件63        {
64try65            {
66                File.Delete(NextFile.FullName);
67            }
68catch { }
69        }
70    }
71}
72///<summary>73/// 读取图片文件到指定目录
74///</summary>75///<param name="img"></param>76///<param name="filePath"></param>77///<returns></returns>78publicstaticstring setImg(byte[] img, string filePath)
79{
80try81    {
82         BinaryWriter bw = new BinaryWriter(File.Open(filePath, FileMode.OpenOrCreate));
83        bw.Write(img);
84        bw.Close();
85return"";
86    }
87catch (Exception ex)
88    {
89return ex.ToString();
90    }
91 }
View Code

 

　　JS开启新窗口的共用方法：

技术分享 技术分享 
                 1
                //
                目的：提供開啟視窗的畫面

                 2
                //
                參數：strUrl-->欲開啟畫面的網址，strParms-->參數，width-->畫面的寬度，height-->畫面的高度

                 3
                //
                      WinName-->開啟的視窗名稱

                 4
                //
                 xx. YYYY/MM/DD   VER     AUTHOR      COMMENTS

                 5
                //
                  1. 2016/08/22   1.00    Anne        Create
                 6
                function OpenNewWin(strUrl,aryParms,width,height,WinName)

                 7
                {

                 8
                var top=0;
 9var left=0; 
10if (height ==‘‘ && width==‘‘){
11         width=screen.availWidth; 
12         height=screen.availHeight;
13     }elseif (height >screen.availHeight && width>screen.availWidth){
14         width=screen.availWidth; 
15         height=screen.availHeight;
16     }else{
17         top=(screen.availHeight-height)/2;
18         left=(screen.availWidth-width)/2;
19    }
20var newWindow = window.open("",WinName,‘width=‘+width+‘px,height=‘+height+‘px,dependent,left=‘+left+‘,top=‘+top+‘,status=no,toolbar=false,menubar=no,scrollbars=yes,resizable=yes‘,true);
21if (!newWindow) returnfalse;
2223var html ="";
24//參數的處理
25//var aryParm=strParms.split("&");//有多少個參數26var i=0;
27for(i=0;i<aryParms.length;i++)
28    {
29//var aryParaTemp = aryParm[i].split("=");//每一個參數30var aryParaTemp = aryParms[i];
31         html += "<input type=‘hidden‘ name=‘" + aryParaTemp[0] + "‘ value=‘" + aryParaTemp[1] + "‘/>";//參數字段32    }
33     html = "<html><head></head><body><form id=‘formid‘ method=‘post‘ action=‘"+strUrl+"‘>"+html; 
34     html += "</form><scr"+"ipt type=‘text/javascript‘>document.getElementById(‘formid‘).submit()</scr"+"ipt></body></html>";
35//html += "</form><script type=‘text/javascript‘>document.getElementById(‘formid‘).submit()</script></body></html>";36     newWindow.document.write(html);//提交post數據37} 
3839//目的：提供開啟視窗的畫面(跨域跳转的话，用OpenNewWin方法，IE浏览器不兼容，故重写一个)
40//參數：strUrl-->欲開啟畫面的網址，strParms-->參數，width-->畫面的寬度，height-->畫面的高度
41//      WinName-->開啟的視窗名稱 42function openNewWin_IE(strUrl,strParam,width,height,name)
43{
44var tempForm = document.createElement("form"); 
45     tempForm.id="tempForm1"; 
46     tempForm.method="post"; 
47     tempForm.action=strUrl; 
48     tempForm.target=name;
49var hideInput = document.createElement("input"); 
50     hideInput.type="hidden"; 
51     hideInput.name= "param"52     hideInput.value= strParam; 
53    tempForm.appendChild(hideInput); 
54     tempForm.attachEvent("onsubmit",function(){funWinOpen("",width,height,name);}); 
55    document.body.appendChild(tempForm); 
56     tempForm.fireEvent("onsubmit"); 
57    tempForm.submit(); 
58    document.body.removeChild(tempForm);
59}
60function openNewWin_IE11(strUrl,strParam,width,height,name)
61{
62var tempForm = document.createElement("form"); 
63     tempForm.id="tempForm1"; 
64     tempForm.method="post"; 
65     tempForm.action=strUrl; 
66     tempForm.target=name;
67var hideInput = document.createElement("input"); 
68     hideInput.type="hidden"; 
69     hideInput.name= "param"70     hideInput.value= strParam; 
71    tempForm.appendChild(hideInput);  
72     tempForm.addEventListener("onsubmit",function(){funWinOpen("",width,height,name);}); 
73    document.body.appendChild(tempForm); 
74    tempForm.submit(); 
75    document.body.removeChild(tempForm);
76}
77function funWinOpen(strUrl,width,height,WinName)
78{
79var top=0;
80var left=0; 
81if (height ==‘‘ && width==‘‘){
82         width=screen.availWidth; 
83         height=screen.availHeight;
84     }elseif (height >screen.availHeight && width>screen.availWidth){
85         width=screen.availWidth; 
86         height=screen.availHeight;
87     }else{
88         top=(screen.availHeight-height)/2;
89         left=(screen.availWidth-width)/2;
90    }
91var newWindow = window.open(strUrl,WinName,‘width=‘+width+‘px,height=‘+height+‘px,dependent,left=‘+left+‘,top=‘+top+‘,status=no,toolbar=false,menubar=no,scrollbars=yes,resizable=yes‘,true);
92 }
View Code

 

　　预览效果图：

技术分享

 

 

 

 

原文：http://www.cnblogs.com/AnneHan/p/7646966.html

内容总结

以上是互联网集市为您收集整理的C# 使用FileUpload控件上传图片，将文件转换成二进制进行存储与读取全部内容，希望文章能够帮你解决C# 使用FileUpload控件上传图片，将文件转换成二进制进行存储与读取所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。

内容备注

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。

内容手机端

扫描二维码推送至手机访问。

本文链接：https://qyyshop.com/info/1315809.html

来源：【匿名】