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簡介

MiniExcel 簡單、高效避免OOM的.NET處理Excel查、寫、填充工具。

目前主流框架大多需要將資料全載入到記憶體方便操作，但這會導致記憶體消耗問題，MiniExcel 嘗試以 Stream 角度寫底層算法邏輯，能讓原本1000多MB占用降低到幾MB，避免記憶體不夠情況。

特點

低記憶體耗用，避免OOM(out of memoery)、頻繁 Full GC 情況
支持即時操作每行資料
兼具搭配 LINQ 延遲查詢特性，能辦到低消耗、快速分頁等複雜查詢
圖片:與主流框架對比的消耗、效率差
輕量，不需要安裝 Microsoft Office、COM+、不依賴任何套件，DLL小於100KB
簡便操作的 API 風格

安裝

請查看 NuGet

更新日誌

請查看 Release Notes

TODO

請查看 TODO

性能測試

以 Test1,000,000x10.xlsx 做基準與主流框架做性能測試，總共 1千萬筆 "HelloWorld"，檔案大小 23 MB

Benchmarks 邏輯可以在 MiniExcel.Benchmarks 查看或是提交 PR，運行指令

dotnet run -p .\benchmarks\MiniExcel.Benchmarks\ -c Release -f netcoreapp3.1 -- -f * --join

最後一次運行結果 :

BenchmarkDotNet=v0.12.1, OS=Windows 10.0.19042
Intel Core i7-7700 CPU 3.60GHz (Kaby Lake), 1 CPU, 8 logical and 4 physical cores
  [Host]     : .NET Framework 4.8 (4.8.4341.0), X64 RyuJIT
  Job-ZYYABG : .NET Framework 4.8 (4.8.4341.0), X64 RyuJIT
IterationCount=3  LaunchCount=3  WarmupCount=3

Method	最大記憶體耗用	平均時間	Gen 0	Gen 1	Gen 2
'MiniExcel QueryFirst'	0.109 MB	726.4 us	-	-	-
'ExcelDataReader QueryFirst'	15.24 MB	10,664,238.2 us	566000.0000	1000.0000	-
'MiniExcel Query'	17.3 MB	14,179,334.8 us	367000.0000	96000.0000	7000.0000
'ExcelDataReader Query'	17.3 MB	22,565,088.7 us	1210000.0000	2000.0000	-
'Epplus QueryFirst'	1,452 MB	18,198,015.4 us	535000.0000	132000.0000	9000.0000
'Epplus Query'	1,451 MB	23,647,471.1 us	1451000.0000	133000.0000	9000.0000
'OpenXmlSDK Query'	1,412 MB	52,003,270.1 us	978000.0000	353000.0000	11000.0000
'OpenXmlSDK QueryFirst'	1,413 MB	52,348,659.1 us	978000.0000	353000.0000	11000.0000
'ClosedXml QueryFirst'	2,158 MB	66,188,979.6 us	2156000.0000	575000.0000	9000.0000
'ClosedXml Query'	2,184 MB	191,434,126.6 us	2165000.0000	577000.0000	10000.0000

Method	最大記憶體耗用	平均時間	Gen 0	Gen 1	Gen 2
'MiniExcel Create Xlsx'	15 MB	11,531,819.8 us	1020000.0000	-	-
'Epplus Create Xlsx'	1,204 MB	22,509,717.7 us	1370000.0000	60000.0000	30000.0000
'OpenXmlSdk Create Xlsx'	2,621 MB	42,473,998.9 us	1370000.0000	460000.0000	50000.0000
'ClosedXml Create Xlsx'	7,141 MB	140,939,928.6 us	5520000.0000	1500000.0000	80000.0000

讀 Excel

支持任何 stream 类型 : FileStream,MemoryStream

1. Query 查詢 Excel 返回`強型別` IEnumerable 資料 [Try it]

public class UserAccount
{
    public Guid ID { get; set; }
    public string Name { get; set; }
    public DateTime BoD { get; set; }
    public int Age { get; set; }
    public bool VIP { get; set; }
    public decimal Points { get; set; }
}

var rows = MiniExcel.Query<UserAccount>(path);

// or

using (var stream = File.OpenRead(path))
    var rows = stream.Query<UserAccount>();

2. Query 查詢 Excel 返回`Dynamic` IEnumerable 資料 [Try it]

Key 系統預設為 A,B,C,D...Z

MiniExcel	1
Github	2


var rows = MiniExcel.Query(path).ToList();

// or 
using (var stream = File.OpenRead(path))
{
    var rows = stream.Query().ToList();
                
    Assert.Equal("MiniExcel", rows[0].A);
    Assert.Equal(1, rows[0].B);
    Assert.Equal("Github", rows[1].A);
    Assert.Equal(2, rows[1].B);
}

3. 查詢資料以第一行數據當Key [Try it]

注意 : 同名以右邊數據為準

Input Excel :

Column1	Column2
MiniExcel	1
Github	2


var rows = MiniExcel.Query(useHeaderRow:true).ToList();

// or

using (var stream = File.OpenRead(path))
{
    var rows = stream.Query(useHeaderRow:true).ToList();

    Assert.Equal("MiniExcel", rows[0].Column1);
    Assert.Equal(1, rows[0].Column2);
    Assert.Equal("Github", rows[1].Column1);
    Assert.Equal(2, rows[1].Column2);
}

4. Query 查詢支援延遲加載(Deferred Execution)，能配合LINQ First/Take/Skip辦到低消耗、高效率複雜查詢

舉例 : 查詢第一筆資料

var row = MiniExcel.Query(path).First();
Assert.Equal("HelloWorld", row.A);

// or

using (var stream = File.OpenRead(path))
{
    var row = stream.Query().First();
    Assert.Equal("HelloWorld", row.A);
}

與其他框架效率比較 :

5. 查詢指定 Sheet 名稱

MiniExcel.Query(path, sheetName: "SheetName");
//or
stream.Query(sheetName: "SheetName");

6. 查詢所有 Sheet 名稱跟資料

var sheetNames = MiniExcel.GetSheetNames(path).ToList();
foreach (var sheetName in sheetNames)
{
    var rows = MiniExcel.Query(path, sheetName: sheetName);
}

7. 查詢所有欄(列)

var columns = MiniExcel.GetColumns(path); // e.g result : ["A","B"...]

var cnt = columns.Count;  // get column count

8. Dynamic Query 轉成 `IDictionary<string,object>` 資料

foreach(IDictionary<string,object> row in MiniExcel.Query(path))
{
    //..
}

9. Query 讀 Excel 返回 DataTable

提醒 : 不建議使用，因為DataTable會將數據全載入內存，失去MiniExcel低記憶體消耗功能。

var table = MiniExcel.QueryAsDataTable(path, useHeaderRow: true);

10. 指定單元格開始讀取資料

MiniExcel.Query(path,useHeaderRow:true,startCell:"B3")

寫 Excel

必須是非abstract 類別有公開無參數構造函數
MiniExcel SaveAs 支援 IEnumerable參數延遲查詢，除非必要請不要使用 ToList 等方法讀取全部資料到記憶體

圖片 : 是否呼叫 ToList 的記憶體差別

1. Anonymous or strongly type [Try it]

var path = Path.Combine(Path.GetTempPath(), $"{Guid.NewGuid()}.xlsx");
MiniExcel.SaveAs(path, new[] {
    new { Column1 = "MiniExcel", Column2 = 1 },
    new { Column1 = "Github", Column2 = 2}
});

2. Datatable:

優先使用 Caption 當欄位名稱

var path = Path.Combine(Path.GetTempPath(), $"{Guid.NewGuid()}.xlsx");
var table = new DataTable();
{
    table.Columns.Add("Column1", typeof(string));
    table.Columns.Add("Column2", typeof(decimal));
    table.Rows.Add("MiniExcel", 1);
    table.Rows.Add("Github", 2);
}

MiniExcel.SaveAs(path, table);

3. Dapper

using (var connection = GetConnection(connectionString))
{
    var rows = connection.Query(@"select 'MiniExcel' as Column1,1 as Column2 union all select 'Github',2");
    MiniExcel.SaveAs(path, rows);
}

4. `IEnumerable<IDictionary<string, object>>`

var values = new List<Dictionary<string, object>>()
{
    new Dictionary<string,object>{{ "Column1", "MiniExcel" }, { "Column2", 1 } },
    new Dictionary<string,object>{{ "Column1", "Github" }, { "Column2", 2 } }
};
MiniExcel.SaveAs(path, values);

output :

Column1	Column2
MiniExcel	1
Github	2

5. SaveAs 支持 Stream，生成文件不落地 [Try it]

using (var stream = new MemoryStream()) //支持 FileStream,MemoryStream..等
{
    stream.SaveAs(values);
}

像是 API 導出 Excel

public IActionResult DownloadExcel()
{
    var values = new[] {
        new { Column1 = "MiniExcel", Column2 = 1 },
        new { Column1 = "Github", Column2 = 2}
    };

    var memoryStream = new MemoryStream();
    memoryStream.SaveAs(values);
    memoryStream.Seek(0, SeekOrigin.Begin);
    return new FileStreamResult(memoryStream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
    {
        FileDownloadName = "demo.xlsx"
    };
}

6. 支持 IDataReader 參數

MiniExcel.SaveAs(path, reader);

模板填充 Excel

宣告方式類似 Vue 模板 {{變量名稱}}, 或是集合渲染 {{集合名稱.欄位名稱}}
集合渲染支持 IEnumerable/DataTable/DapperRow

1. 基本填充

模板:

最終效果:

代碼:

// 1. By POCO
var value = new
{
    Name = "Jack",
    CreateDate = new DateTime(2021, 01, 01),
    VIP = true,
    Points = 123
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);


// 2. By Dictionary
var value = new Dictionary<string, object>()
{
    ["Name"] = "Jack",
    ["CreateDate"] = new DateTime(2021, 01, 01),
    ["VIP"] = true,
    ["Points"] = 123
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);

2. IEnumerable/DataTable 數據填充

Note1: 同行從左往右以第一個 IEnumerableUse 當列表來源 (不支持同列多集合)

模板:

最終效果:

代碼:

//1. By POCO
var value = new
{
    employees = new[] {
        new {name="Jack",department="HR"},
        new {name="Lisa",department="HR"},
        new {name="John",department="HR"},
        new {name="Mike",department="IT"},
        new {name="Neo",department="IT"},
        new {name="Loan",department="IT"}
    }
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);

//2. By Dictionary
var value = new Dictionary<string, object>()
{
    ["employees"] = new[] {
        new {name="Jack",department="HR"},
        new {name="Lisa",department="HR"},
        new {name="John",department="HR"},
        new {name="Mike",department="IT"},
        new {name="Neo",department="IT"},
        new {name="Loan",department="IT"}
    }
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);

3. 複雜數據填充

Note: 支持多 sheet 填充,並共用同一組參數

模板:

最終效果:

代碼:

// 1. By POCO
var value = new
{
    title = "FooCompany",
    managers = new[] {
        new {name="Jack",department="HR"},
        new {name="Loan",department="IT"}
    },
    employees = new[] {
        new {name="Wade",department="HR"},
        new {name="Felix",department="HR"},
        new {name="Eric",department="IT"},
        new {name="Keaton",department="IT"}
    }
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);

// 2. By Dictionary
var value = new Dictionary<string, object>()
{
    ["title"] = "FooCompany",
    ["managers"] = new[] {
        new {name="Jack",department="HR"},
        new {name="Loan",department="IT"}
    },
    ["employees"] = new[] {
        new {name="Wade",department="HR"},
        new {name="Felix",department="HR"},
        new {name="Eric",department="IT"},
        new {name="Keaton",department="IT"}
    }
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);

4. 大數據填充效率比較

NOTE: 在 MiniExcel 使用 IEnumerable 延遲 ( 不ToList ) 可以節省記憶體使用

5. Cell 值自動類別對應

模板

最終效果

類別

public class Poco
{
    public string @string { get; set; }
    public int? @int { get; set; }
    public decimal? @decimal { get; set; }
    public double? @double { get; set; }
    public DateTime? datetime { get; set; }
    public bool? @bool { get; set; }
    public Guid? Guid { get; set; }
}

代碼

var poco = new TestIEnumerableTypePoco { @string = "string", @int = 123, @decimal = decimal.Parse("123.45"), @double = (double)123.33, @datetime = new DateTime(2021, 4, 1), @bool = true, @Guid = Guid.NewGuid() };
var value = new
{
    Ts = new[] {
        poco,
        new TestIEnumerableTypePoco{},
        null,
        poco
    }
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);

6. Example : 列出 Github 專案

模板

最終效果

代碼

var projects = new[]
{
    new {Name = "MiniExcel",Link="https://github.com/shps951023/MiniExcel",Star=146, CreateTime=new DateTime(2021,03,01)},
    new {Name = "HtmlTableHelper",Link="https://github.com/shps951023/HtmlTableHelper",Star=16, CreateTime=new DateTime(2020,02,01)},
    new {Name = "PocoClassGenerator",Link="https://github.com/shps951023/PocoClassGenerator",Star=16, CreateTime=new DateTime(2019,03,17)}
};
var value = new
{
    User = "ITWeiHan",
    Projects = projects,
    TotalStar = projects.Sum(s => s.Star)
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);

7. DataTable 當參數

var managers = new DataTable();
{
    managers.Columns.Add("name");
    managers.Columns.Add("department");
    managers.Rows.Add("Jack", "HR");
    managers.Rows.Add("Loan", "IT");
}
var value = new Dictionary<string, object>()
{
    ["title"] = "FooCompany",
    ["managers"] = managers,
};
MiniExcel.SaveAsByTemplate(path, templatePath, value);

Excel Column Name/Index/Ignore Attribute

e.g

input excel :

public class ExcelAttributeDemo
{
    [ExcelColumnName("Column1")]
    public string Test1 { get; set; }
    [ExcelColumnName("Column2")]
    public string Test2 { get; set; }
    [ExcelIgnore]
    public string Test3 { get; set; }
    [ExcelColumnIndex("I")] // system will convert "I" to 8 index
    public string Test4 { get; set; } 
    public string Test5 { get; } //wihout set will ignore
    public string Test6 { get; private set; } //un-public set will ignore
    [ExcelColumnIndex(3)] // start with 0
    public string Test7 { get; set; }
}

var rows = MiniExcel.Query<ExcelAttributeDemo>(path).ToList();
Assert.Equal("Column1", rows[0].Test1);
Assert.Equal("Column2", rows[0].Test2);
Assert.Null(rows[0].Test3);
Assert.Equal("Test7", rows[0].Test4);
Assert.Null(rows[0].Test5);
Assert.Null(rows[0].Test6);
Assert.Equal("Test4", rows[0].Test7);

Excel 類別自動判斷

MiniExcel 預設會根據擴展名或是 Stream 類別判斷是 xlsx 還是 csv，但會有失準時候，請自行指定。

stream.SaveAs(excelType:ExcelType.CSV);
//or
stream.SaveAs(excelType:ExcelType.XLSX);
//or
stream.Query(excelType:ExcelType.CSV);
//or
stream.Query(excelType:ExcelType.XLSX);

範例

1. SQLite & Dapper 讀取大數據新增到資料庫

note : 請不要呼叫 call ToList/ToArray 等方法，這會將所有資料讀到記憶體內

using (var connection = new SQLiteConnection(connectionString))
{
    connection.Open();
    using (var transaction = connection.BeginTransaction())
    using (var stream = File.OpenRead(path))
    {
	   var rows = stream.Query();
	   foreach (var row in rows)
			 connection.Execute("insert into T (A,B) values (@A,@B)", new { row.A, row.B }, transaction: transaction);
	   transaction.Commit();
    }
}

效能:

2. ASP.NET Core 3.1 or MVC 5 下載/上傳 Excel Xlsx API Demo Try it

public class ApiController : Controller
{
    public IActionResult Index()
    {
        return new ContentResult
        {
            ContentType = "text/html",
            StatusCode = (int)HttpStatusCode.OK,
            Content = @"<html><body>
<a href='api/DownloadExcel'>DownloadExcel</a><br>
<a href='api/DownloadExcelFromTemplatePath'>DownloadExcelFromTemplatePath</a><br>
<a href='api/DownloadExcelFromTemplateBytes'>DownloadExcelFromTemplateBytes</a><br>
<p>Upload Excel</p>
<form method='post' enctype='multipart/form-data' action='/api/uploadexcel'>
    <input type='file' name='excel'> <br>
    <input type='submit' >
</form>
</body></html>"
        };
    }

    public IActionResult DownloadExcel()
    {
        var values = new[] {
            new { Column1 = "MiniExcel", Column2 = 1 },
            new { Column1 = "Github", Column2 = 2}
        };
        var memoryStream = new MemoryStream();
        memoryStream.SaveAs(values);
        memoryStream.Seek(0, SeekOrigin.Begin);
        return new FileStreamResult(memoryStream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
        {
            FileDownloadName = "demo.xlsx"
        };
    }

    public IActionResult DownloadExcelFromTemplatePath()
    {
        string templatePath = "TestTemplateComplex.xlsx";

        Dictionary<string, object> value = new Dictionary<string, object>()
        {
            ["title"] = "FooCompany",
            ["managers"] = new[] {
                new {name="Jack",department="HR"},
                new {name="Loan",department="IT"}
            },
            ["employees"] = new[] {
                new {name="Wade",department="HR"},
                new {name="Felix",department="HR"},
                new {name="Eric",department="IT"},
                new {name="Keaton",department="IT"}
            }
        };

        MemoryStream memoryStream = new MemoryStream();
        memoryStream.SaveAsByTemplate(templatePath, value);
        memoryStream.Seek(0, SeekOrigin.Begin);
        return new FileStreamResult(memoryStream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
        {
            FileDownloadName = "demo.xlsx"
        };
    }

    private static Dictionary<string, Byte[]> TemplateBytesCache = new Dictionary<string, byte[]>();

    static ApiController()
    {
        string templatePath = "TestTemplateComplex.xlsx";
        byte[] bytes = System.IO.File.ReadAllBytes(templatePath);
        TemplateBytesCache.Add(templatePath, bytes);
    }

    public IActionResult DownloadExcelFromTemplateBytes()
    {
        byte[] bytes = TemplateBytesCache["TestTemplateComplex.xlsx"];

        Dictionary<string, object> value = new Dictionary<string, object>()
        {
            ["title"] = "FooCompany",
            ["managers"] = new[] {
                new {name="Jack",department="HR"},
                new {name="Loan",department="IT"}
            },
            ["employees"] = new[] {
                new {name="Wade",department="HR"},
                new {name="Felix",department="HR"},
                new {name="Eric",department="IT"},
                new {name="Keaton",department="IT"}
            }
        };

        MemoryStream memoryStream = new MemoryStream();
        memoryStream.SaveAsByTemplate(bytes, value);
        memoryStream.Seek(0, SeekOrigin.Begin);
        return new FileStreamResult(memoryStream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
        {
            FileDownloadName = "demo.xlsx"
        };
    }

    public IActionResult UploadExcel(IFormFile excel)
    {
        var stream = new MemoryStream();
        excel.CopyTo(stream);

        foreach (var item in stream.Query(true))
        {
            // do your logic etc.
        }

        return Ok("File uploaded successfully");
    }
}

3. 分頁查詢

void Main()
{
	var rows = MiniExcel.Query(path);
	
	Console.WriteLine("==== No.1 Page ====");
	Console.WriteLine(Page(rows,pageSize:3,page:1));
	Console.WriteLine("==== No.50 Page ====");
	Console.WriteLine(Page(rows,pageSize:3,page:50));
	Console.WriteLine("==== No.5000 Page ====");
	Console.WriteLine(Page(rows,pageSize:3,page:5000));
}

public static IEnumerable<T> Page<T>(IEnumerable<T> en, int pageSize, int page)
{
	return en.Skip(page * pageSize).Take(pageSize);
}

4. WebForm不落地導出Excel

var fileName = "Demo.xlsx";
var sheetName = "Sheet1";
HttpResponse response = HttpContext.Current.Response;
response.Clear();
response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
response.AddHeader("Content-Disposition", $"attachment;filename=\"{fileName}\"");
var values = new[] {
    new { Column1 = "MiniExcel", Column2 = 1 },
    new { Column1 = "Github", Column2 = 2}
};
var memoryStream = new MemoryStream();
memoryStream.SaveAs(values, sheetName: sheetName);
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.CopyTo(Response.OutputStream);
response.End();

FAQ 常見問題

Q: Excel 表頭標題名稱跟 class 屬性名稱不一致，如何對應?

A. 請使用 ExcelColumnName 作 mapping

Q. 多工作表(sheet)如何導出/查詢資料?

A. 使用 GetSheetNames 方法搭配 Query 的 sheetName 參數

var sheets = MiniExcel.GetSheetNames(path);
foreach (var sheet in sheets)
{
    Console.WriteLine($"sheet name : {sheet} ");
    var rows = MiniExcel.Query(path,useHeaderRow:true,sheetName:sheet);
    Console.WriteLine(rows);
}

Q. 查詢如何映射枚舉(enum)?

A. 名稱一樣，系統會自動映射(注意:大小寫不敏感)

Q. 是否使用 Count 會載入全部數據到記憶體

不會，圖片測試一百萬行*十列資料，簡單測試，內存最大使用 < 60MB，花費13.65秒

26 KiB Raw Blame History Unescape Escape

簡介

特點

快速開始

安裝

更新日誌

TODO

性能測試

讀 Excel

1. Query 查詢 Excel 返回強型別 IEnumerable 資料 [Try it]

2. Query 查詢 Excel 返回Dynamic IEnumerable 資料 [Try it]

3. 查詢資料以第一行數據當Key [Try it]

4. Query 查詢支援延遲加載(Deferred Execution)，能配合LINQ First/Take/Skip辦到低消耗、高效率複雜查詢

5. 查詢指定 Sheet 名稱

6. 查詢所有 Sheet 名稱跟資料

7. 查詢所有欄(列)

8. Dynamic Query 轉成 IDictionary<string,object> 資料

9. Query 讀 Excel 返回 DataTable

10. 指定單元格開始讀取資料

寫 Excel

1. Anonymous or strongly type [Try it]

2. Datatable:

3. Dapper

4. IEnumerable<IDictionary<string, object>>

5. SaveAs 支持 Stream，生成文件不落地 [Try it]

6. 支持 IDataReader 參數

模板填充 Excel

1. 基本填充

2. IEnumerable/DataTable 數據填充

3. 複雜數據填充

4. 大數據填充效率比較

5. Cell 值自動類別對應

6. Example : 列出 Github 專案

7. DataTable 當參數

Excel Column Name/Index/Ignore Attribute

Excel 類別自動判斷

範例

1. SQLite & Dapper 讀取大數據新增到資料庫

2. ASP.NET Core 3.1 or MVC 5 下載/上傳 Excel Xlsx API Demo Try it

3. 分頁查詢

4. WebForm不落地導出Excel

FAQ 常見問題

Q: Excel 表頭標題名稱跟 class 屬性名稱不一致，如何對應?

Q. 多工作表(sheet)如何導出/查詢資料?

Q. 查詢如何映射枚舉(enum)?

Q. 是否使用 Count 會載入全部數據到記憶體

侷限與警告

參考

Contributors

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Raw Blame History

1. Query 查詢 Excel 返回`強型別` IEnumerable 資料 [Try it]

2. Query 查詢 Excel 返回`Dynamic` IEnumerable 資料 [Try it]

8. Dynamic Query 轉成 `IDictionary<string,object>` 資料

4. `IEnumerable<IDictionary<string, object>>`