增加循环检测按钮

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MIT License
Copyright (c) 2022 Run2948
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# OfficeOpenXml.Extension.AspNetCore
OfficeOpenXml.Extension.AspNetCore 是一个基于 OfficeOpenXml 拓展,它依赖于 [EPPlus](https://www.nuget.org/packages/EPPlus/5.0.3),用于根据模板输出 Excel。
**注意:** 由于 Excel 2003 版本 和 2007 之后版本文件结构的差异性,当前扩展无法同时兼容两种模式,仅支持 *.xlsx 文件!!!
## 快速使用
### 1. 安装组件
* [OfficeOpenXml.Extension.AspNetCore](https://www.nuget.org/packages/OfficeOpenXml.Extension.AspNetCore)
``` bash
dotnet add package OfficeOpenXml.Extension.AspNetCore
```
### 2.使用组件
#### 2.1 读取 Excel 模板, 导入数据
* 准备Excel模板
* [Projects.xlsx](./samples/OfficeOpenXmlSample/wwwroot/templates/Projects.xlsx)
* 定义接收对象
```csharp
[Worksheet(Index = 1, HasHeader = false)]
public class ProjectRow
{
[Column(Number = 1)]
public int Id { get; set; }
[Column(Number = 2)]
public string Name { get; set; }
[Column(Number = 3)]
public string Description { get; set; }
}
```
+ Worksheet - 表格属性,其中 `Index` 对应表格的索引(从 0 开始),`HasHeader` 对应当前表格是否包含表头
+ Column - 单元格属性,其中 `Number` 对应单元格的列
* 读取 Excel 信息
```csharp
[HttpGet("projects", Name = "Projects")]
public IEnumerable<ProjectRow> GetProjects()
{
var excelFilePath = Path.Combine(_wwwroot, "templates", "Projects.xlsx");
var fileStream = new System.IO.FileStream(excelFilePath, FileMode.Open);
using var excelPackage = new ExcelPackage(fileStream);
return excelPackage.ParseWorksheet<ProjectRow>().ToList();
}
```
* 最终结果展示
```json
[
{
"id": 1,
"name": "MyHRW",
"description": "Case Management Tool"
},
{
"id": 2,
"name": "PEX",
"description": "Global Payroll Exchange"
}
]
```
#### 2.2 读取 Excel 模板,导出数据
* 准备Excel模板
* [tpl.xlsx](./samples/OfficeOpenXmlSample/wwwroot/templates/tpl.xlsx)
* 读取模板文件
```csharp
var excelFilePath = Path.Combine(_wwwroot, "templates", "tpl.xlsx");
var fileStream = new System.IO.FileStream(excelFilePath, FileMode.Open);
using var excelPackage = new ExcelPackage(fileStream);
var workBook = excelPackage.Workbook;
```
* 构造填充对象
```csharp
Dictionary<string, IEnumerable<string>> _marketLists = new()
{
{ "水果", new string[] { "桃子", "李子", "香蕉", "梨" } },
{ "蔬菜", new string[] { "青菜", "土豆", "黄瓜", "啤酒" } }
};
//构造model
var model = new
{
ProjectName = "灰太狼",
Name = "Jeff",
CreatedAt = DateTime.Now,
BuyerName = "Bill",
Cates = _marketLists.Select(m => new
{
Name = m.Key,
Items = m.Value.Select(n => new
{
Name = n,
Price = (decimal)random.Next(1, 100),
Amount = random.Next(1, 100)
})
})
};
```
* 填充数据对象
```csharp
// 下面的FillModel就是 OfficeOpenXml.Extension.AspNetCore 提供的拓展方法
workBook.Worksheets.First().FillModel(model);
```
* 导出模板文件
```csharp
string fileName = "Lists_" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xlsx";
string exportFilePath = Path.Combine(_wwwroot, "outputs", fileName);
var exportFile = new FileInfo(exportFilePath);
excelPackage.SaveAs(exportFile);
return File(exportFile.OpenRead(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", fileName);
```
#### 2.3 其他功能辅助说明
* 输出内容目前仅支持基础的变量、成员,不支持方法、运算等高级特性;控制代码目前仅支持 for 循环、嵌套 for 循环以及索引使用索引时需要注意索引计数从1开始因为excel中通常序号从1开始。
* 输出公式的功能用 @= 开头便于程序识别,解析时会将 @ 去掉,后面的内容对 {...} 进行解释并替换。R[-4]表示相对值-4行R[-1]表示相对值-1行C后面没有 [] 表示当前列。
* 具体细节可以进一步参考案例代码:
* [ConsoleApp1](./samples/net45/Program.cs)
* [OfficeOpenXmlSample](./samples/OfficeOpenXmlSample/Controllers/ExcelController.cs)
### 鸣谢
* [OfficeOpenXml.Entends 根据模板导出Excel](https://www.cnblogs.com/mhsg/p/7125112.html)
* [OfficeOpenXml.Extensions EPPlus Extensions](https://github.com/olivierl/OfficeOpenXml.Extensions)

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