實現多張圖片和單張圖片上傳和刪除功能。

前端程式碼如下：

<style>
    #app {
        background-color: white;
        padding: 15px 15px;
    }

    .el-row {
        margin: 60px 20px;
    }

    input[type="file"] {
        display: none;
    }

    .el-form-item__content {
        display: inline-block;
    }
</style>
 

<div id="app">
    <el-button type="primary" icon="el-icon-arrow-left" v-on:click="ReturnGoodsList()">返回</el-button>
    <el-form ref="form" :model="form" status-icon :rules="rules" label-width="100px;" class="demo-ruleForm">

        <el-row>
            <el-col :span
 
="4">
                <el-form-item label="兌換名稱：" prop="Name">
                    <el-input v-model="form.Name"></el-input>
                </el-form-item>
            </el-col>
            <el-col :span="4">
                <el-form-item label="所需積分：" prop="RequireScore"
 
>
                    <el-input v-model.number="form.RequireScore"></el-input>
                </el-form-item>
            </el-col>
            <el-col :span="4">
                <el-form-item label="每人限額：" prop="PerPersonCount">
                    <el-input v-model.number="form.PerPersonCount"></el-input>
                </el-form-item>
            </el-col>
            <el-col :span="4">
                <el-form-item label="總共份額：" prop="Stock">
                    <el-input v-model.number="form.Stock"></el-input>
                </el-form-item>
            </el-col>
            <el-col :span="4">
                <el-form-item label="價格：" prop="Price">
                    <el-input v-model="form.Price"></el-input>
                </el-form-item>
            </el-col>
        </el-row>
        <el-row style="margin-top:20px;">
            <el-col :span="1">
                <label>商品展示圖：</label>
            </el-col>
            <el-col :span="23">
                <el-upload style="display:inline-block;"
                           action="/api/score-mgr/Score/GoodsUploadImg"
                           list-type="picture-card"
                           :auto-upload="false"
                           :data="getScoreForm()"
                           ref="uploadRef"
                           :limit="4"
                           :multiple="true"
                           :file-list="fileList"
                           :on-remove="removePic"
                           :on-success="onSuccess"
                           :on-error="onError">
                    <i slot="default" class="el-icon-plus"></i>
                    <div slot="file" slot-scope="{file}">
                        <img class="el-upload-list__item-thumbnail"
                             :src="file.url" alt="">
                        <span class="el-upload-list__item-actions">
                            <span v-if="true"
                                  class="el-upload-list__item-delete"
                                  v-on:click="removePic(file)">
                                <i class="el-icon-delete"></i>
                            </span>
                        </span>
                    </div>
                </el-upload>
            </el-col>
        </el-row>
        <el-row>
            <el-col :span="1">
                <label>商品說明：</label>
            </el-col>
            <el-col :span="23">
                @*<el-form-item label="商品說明：" prop="desc">
                        <textarea rows="10" v-model="form.Desc" style="width:100%;"></textarea>
                    </el-form-item>*@
                <textarea rows="30" style="width:100%" v-model="form.Desc"></textarea>
            </el-col>
        </el-row>
        <el-row>
            <el-col :span="4">
                <el-form-item label="兌換截至時間：" prop="">
                    <el-date-picker v-model="form.Deadline" type="datetime" placeholder="選擇日期" value-format="yyyy-MM-dd HH:mm:ss">
                    </el-date-picker>
                </el-form-item>
            </el-col>
        </el-row>
        <el-row style="text-align:center;">
            <el-button type="primary" v-on:click="SaveGoods('form')">儲存提交</el-button>
        </el-row>
    </el-form>

</div>

<script src="~/app-js/tools.js"></script>
<script>
    let isSubmiting = false;
    let goodsId = "@(ViewBag.goodsId??0)";
    let imgUrl = GetIMGUrl();
    let imgLength = 0;
    let checkRequireScore = function (rule, value, callback) {
        if (!value) {
            return callback(new Error('所需積分不能為空'));
        }
        if (!Number.isInteger(value)) {
            callback(new Error('請輸入數字值'));
        } else {
            callback();
        }
    };
    let checkPerPersonCount = function (rule, value, callback) {
        if (!value) {
            return callback(new Error('每人限額不能為空'));
        }
        if (!Number.isInteger(value)) {
            callback(new Error('請輸入數字值'));
        } else {
            callback();
        }
    };
    let checkStock = function (rule, value, callback) {
        if (!value) {
            return callback(new Error('每人限額不能為空'));
        }
        if (!Number.isInteger(value)) {
            callback(new Error('請輸入數字值'));
        } else {
            callback();
        }
    };
    let checkPrice = function (rule, value, callback)  {
        var regPos = /^\d+(\.\d+)?$/; //非負浮點數
        //var regNeg = /^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$/; //負浮點數
        if (!regPos.test(value)) {
            callback(new Error('請輸入數字值'));
        } else {
            callback();
        }
    };
    let fileCount = 0;
    let vm = new Vue({
        el: "#app",
        data: {
            form: {
                Name: '',
                RequireScore: '',
                PerPersonCount: '',
                Stock: '',
                Desc: '',
                Price: '',
                Deadline: '',
                Imgs: [],
                removeIdList: [],
            },
            fileList: [],
            uploadFileList: [],
            rules: {
                Name: [
                    { required: true, message: '請輸入物品名稱', trigger: 'blur' },
                ],
                RequireScore: [
                    { validator: checkRequireScore, trigger: 'blur' }
                ],
                PerPersonCount: [
                    { validator: checkPerPersonCount, trigger: 'blur' }
                ],
                Stock: [
                    { validator: checkStock, trigger: 'blur' }
                ],
                Price: [
                    { validator: checkPrice, trigger: 'blur' }
                ],
                desc: [
                    { required: true, message: '請填寫商品描述', trigger: 'blur' }
                ]
            },
        },
        beforeCreate() { },
        created() { },
        beforeMount() { },
        mounted() {
            this.loadGoods();
        },
        components: {

        },
        methods: {
            loadGoods() {
                this.form.removeIdList = [];
                if (goodsId!="0") {
                    ajax({
                        url: '/api/score-mgr/Score/GetGoods',
                        params: {
                            goodsId: goodsId
                        }
                    }).then((res) => {
                        let data = res.data;
                        if (data.Result) {
                            this.form = data.Content;
                            imgLength = data.Content.GoodsImgs.length;
                            for (var i = 0; i < data.Content.GoodsImgs.length; i++) {
                                let obj = new Object();
                                obj.url = imgUrl + data.Content.GoodsImgs[i].ImageUrl;
                                obj.uid = data.Content.GoodsImgs[i].Id;
                                obj.name = data.Content.GoodsImgs[i].Id;
                                this.fileList.push(obj);
                            }
                            this.form.removeIdList = [];
                            fileCount = this.fileList.length;
                        }
                    }).catch((err) => {
                        console.log(err);
                        this.form.removeIdList = [];
                    });
                }
            },
            handleRemove(file) {

            },
            removePic(file) {
                let files = this.$refs.uploadRef.uploadFiles;
                let index = files.findIndex(fileItem => {
                    return fileItem.uid === file.uid
                })
                this.form.removeIdList.push(files[index].uid);
                for (var i = 0; i < this.fileList.length; i++) {
                    if (files[index].uid == this.fileList[i].uid) {
                        fileCount = fileCount - 1;
                    }
                }
                console.log(this.form.removeIdList);
                files.splice(index, 1);
                
            },
            getScoreForm() {
                return this.form;
            },
            onSuccess(res) {
                if (res.Result) {
                    this.form.Imgs.push(res.Content);
                } else {
                    alert("商品資訊儲存失敗,請重新整理頁面重新上傳");
                    return;
                }
                console.log(this.fileList.length);
                //if (this.form.Imgs.length + this.fileList.length == this.$refs.uploadRef.uploadFiles.length + this.form.removeIdList.length)
                console.log(this.form.removeIdList.length);
                console.log(fileCount);
                if (this.form.Imgs.length + fileCount == this.$refs.uploadRef.uploadFiles.length) {
                    ajax({
                        url: '/api/score-mgr/Score/SaveGoods',
                        method: "post",
                        data: this.form
                    }).then((res) => {
                        let data = res.data;
                        if (data.Result) {
                            alert("物品配置儲存成功");
                            location.href = "/Score/ScoreExchange";
                        }

                    }).catch((err) => {
                        console.log(err);
                        alert("儲存錯誤");
                        return;
                    });
                }
            },
            onError(res) {
                isSubmiting = false;
                alert("設定失敗");
                return;
            },
            SaveGoods(formName) {
                this.$refs[formName].validate((valid) => {
                    if (valid) {
                        if (this.$refs.uploadRef.uploadFiles.length > fileCount) {
                            this.form.Imgs = [];
                            console.log(this.$refs.uploadRef.uploadFiles.length);
                            this.$refs.uploadRef.submit();
                            return;
                        }
                        ajax({
                            url: '/api/score-mgr/Score/SaveGoods',
                            method: "post",
                            data: this.form
                        }).then((res) => {
                            let data = res.data;
                            if (data.Result) {
                                alert("物品配置儲存成功");
                                location.href = "/Score/ScoreExchange";
                            }
                        }).catch((err) => {
                            console.log(err);
                            alert("儲存錯誤");
                            return;
                        });
                    }
                    else {
                        alert("請填寫正確的內容，然後儲存提交！");
                        return false;
                    }
                });
            },
            ReturnGoodsList() {
                location.href = "/Score/ScoreExchange";
            }
        }
    });
</script>

因為是後端是mvc模式，前端使用vue模式呼叫介面模式是使用ajax呼叫，所以後端控制器中僅是頁面，沒有介面邏輯，具體的介面程式碼是使用api格式。

後端上傳程式碼如下：

//mvc controller 程式碼：

[MvcPermissionAuthorize("6103")]//許可權驗證
public async Task<IActionResult> AddExchangeSetting()
{
string goodsId = Request.Query["goodsId"];
ViewBag.goodsId = goodsId;
return View();
}

//介面邏輯程式碼：

/// <summary>
        /// 上傳圖片
        /// </summary>
        /// <returns></returns>
        [HttpPost]
        [MvcPermissionAuthorize("6103")]
        public BaseResponseResult<string> GoodsUploadImg()
        {
            BaseResponseResult<string> res = new BaseResponseResult<string>();
            var file = Request.Form.Files.FirstOrDefault();
            if (file == null)
                throw new DFBusinessException("檔案為空");
            var ss = Directory.GetCurrentDirectory();
            //var ss1 = AppContext.BaseDirectory;
            //圖片上傳地址
            string imgAddress = ConfigLoader.ScoreCommonSettings.UploadImageAddress;
            string macPath = ss + "/wwwroot" + imgAddress;

            if (!System.IO.Directory.Exists(macPath))
            {
                Directory.CreateDirectory(macPath); // 不存在就建立目錄 
            }
            System.Drawing.Image img = System.Drawing.Bitmap.FromStream(file.OpenReadStream());
            string fileName = Snowflake_19_Helper.NewId().ToString() + ".jpg";
            string imgPath = macPath + "/" + fileName;
            
            var mstream = ImageHelper.GetThumbPicStream(file.OpenReadStream(),800,800, img.RawFormat, ThumbPicModeEnum.hw);
            Bitmap bt = new Bitmap(mstream);
            bt.Save(imgPath);
            bt.Dispose();
            img.Dispose();
            return res.GetSuccess(imgAddress+"/" + fileName);
        }



/// <summary>
        /// 新添兌換物品
        /// </summary>
        /// <returns></returns>
        [HttpPost]
        [MvcPermissionAuthorize("6103")]
        public async Task<BaseResponseResult<int>> SaveGoods(SaveGoodsModel goods)
        {
            List<GoodsImages> goodsImgs = new List<GoodsImages>();
            if (goods.Imgs != null)
                for (int i = 0; i < goods.Imgs.Count; i++)
                {
                    GoodsImages imgs = new GoodsImages();
                    imgs.Id = Snowflake_19_Helper.NewId();
                    imgs.GoodsId = goods.Id;
                    imgs.ImageUrl = goods.Imgs[i];
                    imgs.CreateTime = DateTime.Now;
                    goodsImgs.Add(imgs);
                }
            goods.CreateTime = DateTime.Now;
            var lst = await _scoreService.SaveGoods(goods, goodsImgs, goods.removeIdList);
            return lst;
        }