README.md

ITnmg.CsvHelper

A library of asynchronous read and write large csv file.
简单易用的 csv 异步读写类库, 可读写大型 csv 文件.

Test Form

写入10万条记录（约127MB）

读取10万条记录（约127MB）

Install

Run the following command in the Package Manager Console.
在 nuget 包管理器控制台输入以下命令

PM> Install-Package ITnmg.CsvHelper

Getting Started

Csv File IETF Standard

IETF RFC4180

Read csv

public async Task ReadCsvAsync( ... )
{
    var csvReader = new CsvReadHelper( ... );
    
    await csvReader.ReadAsync( p => 
    {
        SetColumnHeads( e.ColumnNames );
        ShowData( e.CurrentRowsData );
        SetProgress( Convert.ToInt32( e.ProgressValue ) );
    }, f =>
    {
        return ConvertCsvRowToCustomModel( f );
    }, 1000 );
	
    csvReader.Close();
}

Write csv

public async Task WriteCsvAsync( ... )
{
    var csvWriter = new CsvWriteHelper( ..., f =>
    {
        SetProgressVal( f.WirteRowCount / TotalModelCount );
    }, ... );

    await csvWriter.WriteLineAsync( columnNames );
    await csvWriter.WriteAsync( modelList1, f =>
    {
        return ConvertModelToRowData( f );
    } );
    await csvWriter.WriteAsync( modelList2, f =>
    {
        return ConvertModelToRowData2( f );
    } );

    await csvWriter.FlushAsync();
    csvWriter.Close();
}