C#WinForm自动更新程序之文件上传操作详解

2022-11-13 18:44

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前言

更新都写完了，但是要更新文件要怎么操作呢？连接服务器然后上传上去，修改下xml的版本号当然也是可以的，但是还是没有写个程序使用起来方便，所以这一篇就写一个简单的上传程序。后台依然是使用的.net core webapi，然后新建个控制器来接收上传来的文件。前台就直接使用layui随便搭个上传表单。

开发环境

.NET Core 3.1

开发工具

Visual Studio 2019

实现代码


//控制器代码
namespace AutoUpdate.WebApi.Controllers {
    [Route("api/[controller]")]
    [ApiController]
    public class UploadController : ControllerBase {
        private static object obj = new object();

        [HttpPost]
        public JsonResult Upload() {

            IFormFileCollection formFile = Request.Form.Files;
            if(formFile.Count == 0) {
                throw new Exception("没有文件");
            }

            ReturnResult result = new ReturnResult(Result.success);
            string path = AppContext.BaseDirectory + "files\\";
            string xmlPath = AppContext.BaseDirectory + "UpdateList.xml";
            try {
                foreach(var file in formFile) {
                    string fileName = path + file.FileName;
                    using FileStream fileStream = System.IO.File.Create(fileName);
                    file.CopyTo(fileStream);
                    fileStream.Flush();
                }

                List<string> UpdateFiles = formFile.Select(s => s.FileName).ToList();
                UpdateXml(UpdateFiles);
            }
            catch(Exception ex) {
                result.result = Result.error;
                result.msg = ex.Message;
            }
            return new JsonResult(result);
        }
        private void UpdateXml(List<string> UpdateFiles) {
            lock(obj) {
                string xmlPath = AppContext.BaseDirectory + "UpdateList.xml";
                XDocument xdoc = XDocument.Load(xmlPath);
                foreach(string file in UpdateFiles) {
                    var ele_files = xdoc.Root.Element("files");

                    XElement xele = ele_files.Elements().FirstOrDefault(s => s.Attribute("name").Value == file);
                    if(xele != null) {
                        string oldVer = xele.Attribute("version").Value;
                        xele.SetAttributeValue("version", Math.Round(decimal.Parse(oldVer) + (decimal)0.01, 2));
                    }
                    else {
                        XElement addXele = new XElement("file");
                        addXele.SetAttributeValue("name", file);
                        addXele.SetAttributeValue("version", "1.00");
                        ele_files.Add(addXele);
                    }
                }
                xdoc.Save(xmlPath);
            }
        }
    }
}


//html代码
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>文件更新</title>
    <link rel="stylesheet" href="./layui/css/layui.css" rel="external nofollow" >
</head>
<body>
    <div class="layui-form-item" style="margin:15%">
        <div class="layui-col-md10 layui-col-xs9 layui-form-item-mt5">
            <label class="layui-form-label">文件上传</label>
            <div class="layui-input-block">
                <input type="text" id="filename" name="filename" class="layui-input" readonly />
            </div>
        </div>
        <div class="layui-col-md2 layui-col-xs1 layui-form-item-mt5">
            <button class="layui-btn" id="btnBrowse">浏览</button>
            <button class="layui-btn" id="submit" lay-filter="submit" lay-submit>上传</button>
        </div>
    </div>
    <script class="lazy" data-src="./layui/layui.js"></script>
    <script>
        var layer = layui.layer, form = layui.form, $ = layui.jquery,
            upload = layui.upload;

        form.render();
        upload.render({
            elem: '#btnBrowse'
            , url: 'http://localhost:5000/api/Upload'
            , headers: {}
            , data: {}
            , accept: 'file'
            , multiple: true
            , auto: false
            , bindAction: '#submit'
            , choose: function (obj) {
                $("#filename").val("");
                obj.preview(function (index, file, result) {
                    $("#filename").val($("#filename").val() + file.name + " ; ");
                })
            }
            , done: function (res, index, upload) {
                layer.closeAll('loading');
                layer.msg(res.msg);
            },
            error: function (res) {
                layer.closeAll('loading');
            }
        })
</script>
</body>
</html>