DataGridView可以点击列排序 Sort（使用BindingList改写）

1.DGV排序列要求设定

 public SortableBindingList<Record> record_list = new SortableBindingList<Record> { };
 dataGridView.DataSource = record_list;
 this.dataGridView.Sort(this.dataGridView.Columns["UserName"], ListSortDirection.Ascending);
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2.另一种参考

datagridview的数据显示一般是通过数据绑定来实现，

   this.datagridview.DataSource=this.bindingSrc; 
   this.bindingSrc.DataSource=this.Model; 
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参考： https://www.cnblogs.com/soundcode/p/9507506.html
3.直接重写绑定（就会出现箭头排序）

dataGridView.DataSource = new SortableBindingList<T>(list);
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参考：https://www.cnblogs.com/Lucen/archive/2010/01/15/1648511.html

4. 重写BindingList

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
public class SortableBindingList<T> : BindingList<T>
{
    private bool isSortedValue;
    ListSortDirection sortDirectionValue;
    PropertyDescriptor sortPropertyValue;
    public SortableBindingList() : base() { }
    public SortableBindingList(IList<T> list) : base(list) { }
    protected override void ApplySortCore(PropertyDescriptor prop,
        ListSortDirection direction)
    {
        Type interfaceType = prop.PropertyType.GetInterface("IComparable");
        if (interfaceType == null && prop.PropertyType.IsValueType)
        {
            Type underlyingType = Nullable.GetUnderlyingType(prop.PropertyType);
            if (underlyingType != null)
            {
                interfaceType = underlyingType.GetInterface("IComparable");
            }
        }
        if (interfaceType != null)
        {
            sortPropertyValue = prop;
            sortDirectionValue = direction;
            IEnumerable<T> query = base.Items;
            if (direction == ListSortDirection.Ascending)
                query = query.OrderBy(i => prop.GetValue(i));
            else
                query = query.OrderByDescending(i => prop.GetValue(i));
            int newIndex = 0;
            foreach (object item in query)
            {
                this.Items[newIndex] = (T)item;
                newIndex++;
            }
            isSortedValue = true;
            sorting = true;
            this.OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
            sorting = false;
        }
        else
        {
            throw new NotSupportedException("Cannot sort by " + prop.Name +
                ". This" + prop.PropertyType.ToString() +
                " does not implement IComparable");
        }
    }
    bool sorting = false;
    protected override PropertyDescriptor SortPropertyCore
    {
        get { return sortPropertyValue; }
    }
    protected override ListSortDirection SortDirectionCore
    {
        get { return sortDirectionValue; }
    }
    protected override bool SupportsSortingCore
    {
        get { return true; }
    }
    protected override bool IsSortedCore
    {
        get { return isSortedValue; }
    }
    protected override void RemoveSortCore()
    {
        isSortedValue = false;
        sortPropertyValue = null;
    }
    protected override void OnListChanged(ListChangedEventArgs e)
    {
        if (!sorting && sortPropertyValue != null)
            ApplySortCore(sortPropertyValue, sortDirectionValue);
        else
            base.OnListChanged(e);
    }
}
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可以用更简单的方法：
使用BindingList.Insert() 插入到对应的index值排序下。