Nukepayload2.Csv

Nukepayload2.Csv is a cross-platform Csv String <==> .NET Object converter.

Supported types in csv columns:

• System.String
• System.DateTime
• System.DateTime?
• System.Int32
• System.Int32?
• System.Int64
• System.Int64?
• System.Single
• System.Single?
• System.Double
• System.Double?
• System.Boolean
• System.Boolean?

Feature status

Get on Nuget

https://www.nuget.org/packages/Nukepayload2.Csv

如果你需要中文介绍，请向下滚动页面。

Sample Code

Convert Csv string to .NET Object

Goal: convert the following csv string to .NET Object.

Id,Rate,Name,Date,IsUsed
-233,12345.12,test string,2018-05-09,True
0,-12345.12,,2018-09-09,False

1. Create a model class

VB

Public Class MyCsvModel
    Public Property Id As Integer
    Public Property Rate As Double
    Public Property Name As String
    Public Property [Date] As Date
    Public Property IsUsed As Boolean
End Class

C#

public class MyCsvModel
{
    public int Id { get; set; }
    public double Rate { get; set; }
    public string Name { get; set; }
    public DateTime Date { get; set; }
    public bool IsUsed { get; set; }
}

2. Convert csv to IReadOnlyList of MyCsvModel

Assume that csv is a System.String that contains csv.

VB

Dim converted = CsvConvert.DeserializeObject(Of MyCsvModel)(csv)

C#

var converted = CsvConvert.DeserializeObject<MyCsvModel>(csv);

Convert .NET Object back to Csv string

VB

csv = CsvConvert.SerializeObject(converted)

C#

csv = CsvConvert.SerializeObject(converted);

VB and C# model Code generator (Preview)

1. Clone this repo.
2. Make sure .NET Core 2.x or higher SDK is installed.
3. Open cmd or bash in cloned code's root directory.
4. Go the ModelGenerator directory cd Nukepayload2.Csv.ModelGenerator
5. Build the project dotnet build Nukepayload2.Csv.ModelGenerator.vbproj
6. To see help, execute dotnet run Nukepayload2.Csv.ModelGenerator.dll (Change \ to / on Linux) .

What is next?

• [Prototyping] Column-oriented storage for loading huge csv file.
• [Pending] Lower allocation (waiting for ref struct support in VB) https://github.com/dotnet/vblang/issues/297 .
• [Pending] Optimize getter and setter for Int32, Int64, Single and Double since they are frequently used in csv.

Nukepayload2.Csv 中文介绍

Nukepayload2.Csv 是一个跨平台的 Csv 字符串 <==> .NET 对象转换器。

在 csv 每一列中支持的数据类型:

• System.String
• System.DateTime
• System.DateTime?
• System.Int32
• System.Int32?
• System.Int64
• System.Int64?
• System.Single
• System.Single?
• System.Double
• System.Double?
• System.Boolean
• System.Boolean?

功能状态

在 Nuget 下载

https://www.nuget.org/packages/Nukepayload2.Csv

示例代码

将 Csv 字符串转换为 .NET 对象

目标: 把下面的 csv 字符串转换为 .NET 对象

Id,Rate,Name,Date,IsUsed
-233,12345.12,test string,2018-05-09,True
0,-12345.12,,2018-09-09,False

1. 创建模型类

VB

Public Class MyCsvModel
    Public Property Id As Integer
    Public Property Rate As Double
    Public Property Name As String
    Public Property [Date] As Date
    Public Property IsUsed As Boolean
End Class

C#

public class MyCsvModel
{
    public int Id { get; set; }
    public double Rate { get; set; }
    public string Name { get; set; }
    public DateTime Date { get; set; }
    public bool IsUsed { get; set; }
}

2. 将 csv 转换为 MyCsvModel 的 IReadOnlyList

假定 csv 是包含 csv 的 System.String。

VB

Dim converted = CsvConvert.DeserializeObject(Of MyCsvModel)(csv)

C#

var converted = CsvConvert.DeserializeObject<MyCsvModel>(csv);

将 .NET 对象转换为 Csv 字符串

VB

csv = CsvConvert.SerializeObject(converted)

C#

csv = CsvConvert.SerializeObject(converted);

VB 和 C# 模型代码生成器（预览）

1. 克隆此仓库.
2. 确保 .NET Core 2.x SDK 安装了.
3. 在克隆后的代码根目录打开 cmd 或者 bash.
4. 进入生成器的目录 cd Nukepayload2.Csv.ModelGenerator
5. 编译 dotnet build Nukepayload2.Csv.ModelGenerator.vbproj
6. 执行命令查看查看帮助 dotnet run Nukepayload2.Csv.ModelGenerator.dll (Linux 上把 \ 改成 /) .

下一步的计划?

• [做原型] 为大型 Csv 准备的列式存储。
• [挂起] 减少内存分配 （等 ref struct 在 VB 能用了再说） https://github.com/dotnet/vblang/issues/297 。
• [挂起] 为常用的 Int32, Int64, Single 和 Double 提供读写性能优化。