Winform DataGridView修改数据源界面不刷新问题

错误描述

对于dataGridView，设置数据源为一个List集合时，修改了List集合以后即使重新设置数据源界面也不会刷新。

注：如果先设置DataSource=null;可以重新加载，但是界面设计器里面设置的列名称，表头全部消失。

解决方法

1. 设置数据源为DataTable
2. 使用Rows.Add方法添加子项，需要重新加载数据时，先用Rows.Clear清理所有子项。

示例代码

private void BindData()
        {
            this.dgvMappings.ColumnCount = 5;
            this.dgvMappings.Columns[0].HeaderText = "数据源表名称";
            this.dgvMappings.Columns[1].HeaderText = "数据源表主键";
            this.dgvMappings.Columns[2].HeaderText = "目标表名称";
            this.dgvMappings.Columns[3].HeaderText = "数据源查询字段";
            this.dgvMappings.Columns[4].HeaderText = "目标表插入字段";

            this.dgvMappings.Columns[0].Name = "SourceTableName";
            this.dgvMappings.Columns[1].Name = "SourceTablePrimaryKey";
            this.dgvMappings.Columns[2].Name = "TargetTableName";
            this.dgvMappings.Columns[3].Name = "SourceFields";
            this.dgvMappings.Columns[4].Name = "TargetFields";

            this.dgvMappings.Columns[0].Width = 100;
            this.dgvMappings.Columns[1].Width = 100;
            this.dgvMappings.Columns[2].Width = 100;
            this.dgvMappings.Columns[3].Width = 215;
            this.dgvMappings.Columns[4].Width = 215;

            this.dgvMappings.Rows.Clear();
            foreach(var map in settings.TableMapings)
            {
                this.dgvMappings.Rows.Add(new string[] { map.SourceTableName,map.SourceTablePrimaryKey,map.TargetTableName,map.SourceFields,map.TargetFields });
            }

        }