Example of datatable to list for c

  • 2020-06-15 10:07:07
  • OfStack


using System;
using System.Collections.Generic;
using System.Data;
using System.Reflection;
namespace jdrz.HumanIdentify
{
    public class Helper
    {
        /// <summary>
        /// DataTable  convert List  A collection of 
        /// </summary>
        /// <typeparam name="TResult"> type </typeparam>
        /// <param name="dt">DataTable</param>
        /// <returns></returns>
        public static List<TResult> ToList<TResult>(DataTable dt) where TResult : class, new()
        {
            // create 1 A list of attributes 
            var prlist = new List<PropertyInfo>();
            // To obtain TResult Type instance of    Reflected entrance 
            var t = typeof(TResult);
            // To obtain TResult  Of all the Public  attribute   And find out TResult Properties and DataTable Attributes with the same column name (PropertyInfo)  And add it to the property list  
            Array.ForEach(t.GetProperties(), p => { if (dt.Columns.IndexOf(p.Name) != -1) prlist.Add(p); });
            // Creates the returned collection 
            var oblist = new List<TResult>();
            foreach (DataRow row in dt.Rows)
            {
                // create TResult An instance of the 
                var ob = new TResult();
                // Find the corresponding data    And the assignment 
                prlist.ForEach(p => { if (row[p.Name] != DBNull.Value) p.SetValue(ob, row[p.Name], null); });
                // Into the returned collection .
                oblist.Add(ob);
            }
            return oblist;
        }
    }
}


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