Question

我应该如何将以下LINQ代码转换为.Net 2.0代码？

由于~~公司政策~~，我无法将其升级到.Net 3.5。

GetErrorLog将由ObjectDataSource使用。

为了使下面的代码有效，我使用http://weblogs.asp.net/scottgu/dynamic-linq-part-1-using-the-linq-dynamic-query-library

中的System.Linq.Dynamic

    public class errorLog
    {
        public string fileName { get; set; }
        public string filePath { get; set; }
    }

    public static IQueryable<errorLog> GetErrorLog(int startRowIndex, int maximumRows, string sortExpression, string logPath)
    {
        if (string.IsNullOrEmpty(sortExpression))
        {
            sortExpression = "fileName";
        }
        string[] filePaths = Directory.GetFiles(logPath);
        List<errorLog> files = new List<errorLog>();

        foreach (string filePath in filePaths)
        {
            files.Add(new errorLog { fileName = Path.GetFileName(filePath), filePath = filePath });
        }

        return files.AsQueryable().OrderBy(sortExpression).Skip(startRowIndex).Take(maximumRows);
    }

Answer 1

我是这样做的，欢迎任何更好的答案。

public static DataTable GetErrorLog(int startRowIndex, int maximumRows, string sortExpression, string logPath)
{
    if (string.IsNullOrEmpty(sortExpression))
    {
        sortExpression = "fileName DESC";
    }

    DataTable errorLog = GetErrorLogDataTable();

    string[] filePaths = Directory.GetFiles(logPath);
    foreach (string filePath in filePaths)
    {
        DataRow row = errorLog.NewRow();
        row["fileName"] = Path.GetFileName(filePath);
        row["filePath"] = filePath;
        errorLog.Rows.Add(row);
    }

    DataView dataView = new DataView(errorLog);
    dataView.Sort = sortExpression;
    errorLog = dataView.ToTable();
    DataTable pagedErrorLog = errorLog.Clone();

    for (int i = startRowIndex; i < startRowIndex + maximumRows; i++)
    {
        if (i >= errorLog.Rows.Count)
        {
            break;
        }
        pagedErrorLog.ImportRow(errorLog.Rows[i]);
    }

    if (pagedErrorLog.Rows.Count <= 0)
    {
        return errorLog;
    }
    else
    {
        return pagedErrorLog;
    }
}

private static DataTable GetErrorLogDataTable()
{
    DataTable dataTable = new DataTable();
    dataTable.Columns.Add("fileName");
    dataTable.Columns.Add("filePath");
    return dataTable;
}

将LINQ代码转换为.Net 2.0代码

1 个答案: