一个全面且高效的C#帮助类库（c# 类库查询手册）

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项目介绍

Common.Utility是一个C#编写的实用工具库，它收集并整理了大量的辅助类，旨在提供一系列方便开发者在.NET环境中使用的功能。

日常工作收集，各式各样的几乎都能找到，所有功能性代码都是独立的类，类与类之间没有联系，可以单独引用至项目。

功能介绍

CSVHelper

 using Quartz.Util;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.OleDb;
using System.IO;
using System.Linq;
using System.Text;

namespace DotNet.Utilities.CSVHelper
{
 public class CSVHelper
 {

 /// 
 /// CSV转换成DataTable（OleDb数据库访问方式）
 /// 

 /// <param name="csvPath">csv文件路径
 /// 
 public static DataTable CSVToDataTableByOledb(string csvPath)
 {
 DataTable csvdt = new DataTable("csv");
if (!File.Exists(csvPath))
 {
 throw new FileNotFoundException("csv文件路径不存在!");
 }

 FileInfo fileInfo = new FileInfo(csvPath);
 using (OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileInfo.DirectoryName + ";Extended Properties='Text;'"))
 {
 OleDbDataAdapter adapter = new OleDbDataAdapter("SELECT * FROM [" + fileInfo.Name + "]", conn);
 adapter.Fill(csvdt);
 }
return csvdt;
 }

 /// 
 /// CSV转换成DataTable（文件流方式）
 /// 

 /// <param name="csvPath">csv文件路径
 /// 
 public static DataTable CSVToDataTableByStreamReader(string csvPath)
 {
 DataTable csvdt = new DataTable("csv");

 int intColCount = 0;
 bool blnFlag = true;
 DataColumn column;
 DataRow row;
 string strline = ;
 string[] aryline;
 Encoding encoding=;

 using (StreamReader reader = new StreamReader(csvPath, encoding))
 {
while (!string.IsOrEmpty((strline = reader.ReadLine())))
 {
 aryline = strline.Split(new char[] { ',' });

if (blnFlag)
 {
 blnFlag = false;
 intColCount = aryline.Length;
for (int i = 0; i < aryline.Length; i++)
 {
 column = new DataColumn(aryline[i]);
 csvdt.Columns.Add(column);
 }
continue;
 }

 row = csvdt.NewRow();
for (int i = 0; i < intColCount; i++)
 {
 row[i] = aryline[i];
 }
 csvdt.Rows.Add(row);
 }
 }

return csvdt;
 }

 /// 
 /// DataTable 生成 CSV
 /// 

 /// <param name="dt">DataTable
 /// <param name="csvPath">csv文件路径
 public static void DataTableToCSV(DataTable dt, string csvPath)
 {
if ( == dt)
return;

 StringBuilder csvText = new StringBuilder();
 StringBuilder csvrowText = new StringBuilder();
 foreach (DataColumn dc in dt.Columns)
 {
 csvrowText.Append(",");
 csvrowText.Append(dc.ColumnName);
 }
 csvText.AppendLine(csvrowText.ToString().Substring(1));

 foreach (DataRow dr in dt.Rows)
 {
 csvrowText = new StringBuilder();
 foreach (DataColumn dc in dt.Columns)
 {
 csvrowText.Append(",");
 csvrowText.Append(dr[dc.ColumnName].ToString().Replace(',', ' '));
 }
 csvText.AppendLine(csvrowText.ToString().Substring(1));
 }

 File.WriteAllText(csvPath, csvText.ToString(), Encoding.Default);
 }
 }
}

DataTable转实体

 public static class DataTableExtensions
 {
 public static T ToEntity(this DataTable table) where T : new()
 {
 T entity = new T();
 foreach (DataRow row in table.Rows)
 {
 foreach (var item in entity.GetType().GetProperties())
 {
if (row.Table.Columns.Contains(item.Name))
 {
if (DB.Value != row[item.Name])
 {
 Type newType = item.PropertyType;
 //判断type类型是否为泛型，因为able是泛型类,
if (newType.IsGenericType
 && newType.GetGenericTypeDefinition().Equals(typeof(able<>)))//判断convertsionType是否为able泛型类
 {
 //如果type为able类，声明一个ableConverter类，该类提供从able类到基础基元类型的转换
 System.ComponentModel.ableConverter ableConverter = new System.ComponentModel.ableConverter(newType);
 //将type转换为able对的基础基元类型
 newType = ableConverter.UnderlyingType;
 }

 item.SetValue(entity, Convert.ChangeType(row[item.Name], newType), );

 }

 }
 }
 }

return entity;
 }

 public static List ToEntities(this DataTable table) where T : new()
 {
 List entities = new List();
if (table == )
return ;
 foreach (DataRow row in table.Rows)
 {
 T entity = new T();
 foreach (var item in entity.GetType().GetProperties())
 {
if (table.Columns.Contains(item.Name))
 {
if (DB.Value != row[item.Name])
 {
 Type newType = item.PropertyType;
 //判断type类型是否为泛型，因为able是泛型类,
if (newType.IsGenericType
 && newType.GetGenericTypeDefinition().Equals(typeof(able<>)))//判断convertsionType是否为able泛型类
 {
 //如果type为able类，声明一个ableConverter类，该类提供从able类到基础基元类型的转换
 System.ComponentModel.ableConverter ableConverter = new System.ComponentModel.ableConverter(newType);
 //将type转换为able对的基础基元类型
 newType = ableConverter.UnderlyingType;
 }
 item.SetValue(entity, Convert.ChangeType(row[item.Name], newType), );
 }
 }
 }
 entities.Add(entity);
 }
return entities;
 }
 }