我们如何在winform中的datagridview中进行分页

Question

我想在窗口表单的datagridview中显示每页10条记录,用户必须单击下一步按钮才能显示下10条记录.是否在DataGridview中有一些属性或者我是否需要创建自定义控件.

我需要做些什么来实现这一目标.

Answer 1

这是一个简单的工作示例,其中 BindingNavigator GUI控件使用 BindingSource对象来识别分页符,方法是将其DataSource设置为IListSource的自定义子类.(感谢关键思想的答案.)当用户单击"下一页"按钮时,BindingNavigator将触发bindingSource1_CurrentChanged,您的代码可以获取所需的记录.说明:

1. 创建Windows窗体应用程序
2. 将BindingNavigator,DataGridView和BindingSource拖到窗体上
3. 用以下代码替换Form1.cs:

using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace PagedDataGridView
{
    public partial class Form1 : Form
    {
        private const int totalRecords = 43;
        private const int pageSize = 10;

        public Form1()
        {
            InitializeComponent();
            dataGridView1.Columns.Add(new DataGridViewTextBoxColumn { DataPropertyName = "Index" });
            bindingNavigator1.BindingSource = bindingSource1;
            bindingSource1.CurrentChanged += new System.EventHandler(bindingSource1_CurrentChanged);
            bindingSource1.DataSource = new PageOffsetList();
        }

        private void bindingSource1_CurrentChanged(object sender, EventArgs e)
        {
            // The desired page has changed, so fetch the page of records using the "Current" offset 
            int offset = (int)bindingSource1.Current;
            var records = new List<Record>();
            for (int i = offset; i < offset + pageSize && i < totalRecords; i++)
                records.Add(new Record { Index = i });
            dataGridView1.DataSource = records;
        }

        class Record
        {
            public int Index { get; set; }
        }

        class PageOffsetList : System.ComponentModel.IListSource
        {
            public bool ContainsListCollection { get; protected set; }

            public System.Collections.IList GetList()
            {
                // Return a list of page offsets based on "totalRecords" and "pageSize"
                var pageOffsets = new List<int>();
                for (int offset = 0; offset < totalRecords; offset += pageSize)
                    pageOffsets.Add(offset);
                return pageOffsets;
            }
        }
    }
}

Answer 2

这是我的解决方案:我花了将近一年的时间才找到它,并以此为荣

public class SuperGrid : DataGridView
    {
        public int PageSize
        {
            get
            {
                return _pageSize;
            }
            set
            {
                _pageSize = value;
            }
        }
        public int _pageSize = 10;
        BindingSource bs = new BindingSource();
        BindingList<DataTable> tables = new BindingList<DataTable>();
        public void SetPagedDataSource(DataTable dataTable, BindingNavigator bnav)
        {
            DataTable dt = null;
            int counter = 1;
            foreach (DataRow dr in dataTable.Rows)
            {
                if (counter == 1)
                {
                    dt = dataTable.Clone();
                    tables.Add(dt);
                }
                dt.Rows.Add(dr.ItemArray);
                if (PageSize < ++counter  )
                {
                    counter = 1;
                }
            }
            bnav.BindingSource = bs;
            bs.DataSource = tables;
            bs.PositionChanged += bs_PositionChanged;
            bs_PositionChanged(bs, EventArgs.Empty);
        }
        void bs_PositionChanged(object sender, EventArgs e)
        {
            this.DataSource = tables[bs.Position];
        }
    }

如何使用它？将上面的代码添加到项目中,将Supergrid和bindingnavigator控件拖到win表单中.

 superGrid1.PageSize = 5;
 DataTable dt = DataProvider.ExecuteDt("select * from test order by col");
  superGrid1.SetPagedDataSource(dt, bindingNavigator1);

并且您获得了一个带有数据绑定的分页Datagridview而没有太多hastle /