一、DEMO效果
先选择图片，点击上传后，即可在照片预览中看到照片。如果需要更改，重新上传就可覆盖原图片。
二、代码
页面端，这里有个细节：再次上传后，如果<img>的URL不变，浏览器会从缓存中读取图片，这就会导致图片预览不会刷新，不显示刚上传的图片。解决这个问题只需要 传一个随机字符串作为参数即可。
@{Layout = "~/Views/Shared/_LayoutPage1.cshtml";}<!DOCTYPE html><html><head><meta name="viewport" content="width=device-width" /><title>图片编辑</title><link href="~/Scripts/bootstrap-datetimepicker/css/bootstrap-datetimepicker.min.css" rel="stylesheet" /><link href="~/Scripts/toastr/build/toastr.min.css" rel="stylesheet" /><script src="~/Scripts/bootstrap-datetimepicker/js/bootstrap-datetimepicker.min.js"></script><script src="~/Scripts/bootstrap-datetimepicker/js/locales/bootstrap-datetimepicker.zh-CN.js"></script><script src="~/Scripts/this/customEditor_fieldTypes.js"></script><script src="~/Scripts/this/tools.js"></script><script src="~/Scripts/toastr/build/toastr.min.js"></script></head><body><div class="row"><div class="col-md-12"><ul class="nav nav-tabs" id="myTab" style="margin-top:20px"><li class="active"><a href="#tab_1" data-toggle="tab" class="btn" id="tabone">图片信息</a></li></ul><div class="tab-pane fade active in" id="tab_1"><div class="form-group col-md-6">@using (Ajax.BeginForm("", null, new AjaxOptions() { OnSuccess = "PostSuc", OnFailure = "PostFail", HttpMethod = "Post" }, new { enctype = "multipart/form-data", id = "FormImg" })){<input type="hidden" name="EmployeeId" id="EmployeeId"><span class="btn btn-default fileinput-button"><input type="file" name="file1" id="file1"></span><button class="btn btn-primary start" type="button" id="btnpictureid"><span><i class="fa fa-file"></i> 上传</span></button><fieldset><legend>照片预览</legend><img id="headimg" src="@Url.Action("ShowImage","Basic",new { @ViewBag.EmployeeId})" /></fieldset>}</div></div></div></div></body></html><script type="text/javascript">var EmployeeId = @ViewBag.EmployeeId;$(document).ready(function () {$("#EmployeeId").val(EmployeeId);$("#btnpictureid").bind("click", function () { SaveImg(); });})function SaveImg() {$("#FormImg").attr("data-ajax-success", "OnSaveImgSuccess(data)");$("#FormImg").attr("data-ajax-failure", "OnSaveImgFail()");$("#FormImg").attr("action", "/Basic/UploadImg");$("#FormImg").submit();}function OnSaveImgSuccess(data) {if (data.result == "success") {toastr.success("上传成功");$("#headimg").attr({ "src": "/Basic/ShowImage?EmployeeId=" + @ViewBag.EmployeeId +"&Random=" + (Math.random()*100)+1});//解决因为URL没变导致图片不刷新的问题}else {toastr.error(data.msg);}}function OnSaveImgFail(msg) {toastr.error("图片上传失败,请重试!");}</script>
三、控制器端代码
///显示图片 public ActionResult ShowImage(long EmployeeId,int Random = 999 ){byte[] byData = _IEmployeeInfo.GetEmployeeById(EmployeeId).Image;return File(byData, @"image/jpeg");}///上传图片public ActionResult UploadImg(long EmployeeId){string msg = string.Empty;string result = string.Empty;byte[] imgData = null;int flag = 0;if (Request.Files.Count > 0){HttpPostedFileBase file = Request.Files["file1"];if (file.ContentLength < 100 * 1024){string fileType = System.IO.Path.GetExtension(file.FileName);//获取文件类型if (fileType != null){fileType = fileType.ToLower();//将文件类型转化成小写if ("(.gif)|(.jpg)|(.bmp)|(.jpeg)|(.png)".Contains(fileType)){imgData = new byte[file.ContentLength];//新建一个长度等于图片大小的二进制地址file.InputStream.Read(imgData, 0, file.ContentLength);//将image读取到ImageData中flag = _IEmployeeInfo.UpdateImg(EmployeeId, imgData);if (flag > 0){result = Tips.success;}}else{msg = "只支持图片格式";result = Tips.fail;}}}else{msg = "图片大小不能超过100KB";result = Tips.fail;}}else{msg = "上传图片不能为空";result = Tips.fail;}return Json(new Res { result = result, msg = msg });}
