第19章-高级应用与扩展

第十九章：高级应用与扩展

19.1 插件系统

public interface IReoGridPlugin
{
    string Name { get; }
    string Description { get; }
    void Initialize(ReoGridControl grid);
    void Uninitialize();
}

public class ExamplePlugin : IReoGridPlugin
{
    public string Name => "示例插件";
    public string Description => "这是一个示例插件";
    
    private ReoGridControl grid;
    
    public void Initialize(ReoGridControl grid)
    {
        this.grid = grid;
        // 初始化插件
        RegisterMenuItems();
    }
    
    private void RegisterMenuItems()
    {
        // 添加自定义菜单项
    }
    
    public void Uninitialize()
    {
        // 清理资源
    }
}

19.2 自定义渲染器

using unvell.ReoGrid.Rendering;

public class CustomCellRenderer : ICellRenderer
{
    public void DrawCell(CellDrawingContext dc, Cell cell)
    {
        // 自定义单元格渲染逻辑
        var bounds = cell.Bounds;
        
        // 绘制自定义背景
        dc.Graphics.FillRectangle(
            new SolidBrush(Color.LightYellow),
            bounds
        );
        
        // 绘制文本
        if (cell.Data != null)
        {
            dc.Graphics.DrawString(
                cell.Data.ToString(),
                cell.Style.Font,
                Brushes.Black,
                bounds
            );
        }
    }
}

19.3 数据源集成

public class DatabaseIntegration
{
    public void LoadFromDatabase(Worksheet sheet, string connectionString, string query)
    {
        using (var connection = new SqlConnection(connectionString))
        {
            connection.Open();
            using (var command = new SqlCommand(query, connection))
            using (var reader = command.ExecuteReader())
            {
                sheet.BeginUpdate();
                try
                {
                    // 加载列头
                    for (int i = 0; i < reader.FieldCount; i++)
                    {
                        sheet[0, i] = reader.GetName(i);
                    }
                    
                    // 加载数据
                    int row = 1;
                    while (reader.Read())
                    {
                        for (int col = 0; col < reader.FieldCount; col++)
                        {
                            sheet[row, col] = reader[col];
                        }
                        row++;
                    }
                }
                finally
                {
                    sheet.EndUpdate();
                }
            }
        }
    }
}

19.4 Web API集成

using System.Net.Http;
using Newtonsoft.Json;

public class WebApiIntegration
{
    public async Task LoadFromWebApi(Worksheet sheet, string apiUrl)
    {
        using (var client = new HttpClient())
        {
            var json = await client.GetStringAsync(apiUrl);
            var data = JsonConvert.DeserializeObject<List<Dictionary<string, object>>>(json);
            
            sheet.BeginUpdate();
            try
            {
                // 加载数据到工作表
                int row = 0;
                foreach (var item in data)
                {
                    int col = 0;
                    foreach (var kvp in item)
                    {
                        if (row == 0)
                        {
                            sheet[row, col] = kvp.Key;  // 列头
                        }
                        sheet[row + 1, col] = kvp.Value;  // 数据
                        col++;
                    }
                    row++;
                }
            }
            finally
            {
                sheet.EndUpdate();
            }
        }
    }
}

19.5 多线程支持

public class MultiThreading
{
    public async Task LoadDataAsync(Worksheet sheet, DataTable dataTable)
    {
        await Task.Run(() =>
        {
            sheet.BeginUpdate();
            try
            {
                // 在后台线程加载数据
                for (int r = 0; r < dataTable.Rows.Count; r++)
                {
                    for (int c = 0; c < dataTable.Columns.Count; c++)
                    {
                        sheet[r, c] = dataTable.Rows[r][c];
                    }
                }
            }
            finally
            {
                // 回到UI线程更新
                Application.Current.Dispatcher.Invoke(() =>
                {
                    sheet.EndUpdate();
                });
            }
        });
    }
}

19.6 本章小结

本章介绍了ReoGrid的高级应用和扩展方法。

📚 下一章预告

第二十章将学习实战案例与综合应用。