C# 未对记录进行排序

我试图在jQueryJTable中对记录进行排序，但它没有对记录进行排序。我正在从excel文件中获取记录

下面是我试图对记录进行排序的代码的排序位：

if (sorting != null)
{
 daa.OrderByDescending(i => i.Date);
}

以下是我的完整代码供您检查：

public JsonResult TopPlayedInVenueList1(string sorting, string StartDate = "", string EndDate = "", int jtStartIndex = 0, int jtPageSize = 0, string jtSorting = null)
    {
        try
        {

            if (Request.IsAuthenticated == true)
            {
                string Path = @"C:\\5Newwithdate-1k.xls";
                OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source= '" + Path + "';Extended Properties=" + (char)34 + "Excel 8.0;IMEX=1;" + (char)34 + "");
                OleDbDataAdapter da = new OleDbDataAdapter("select * from [Sheet1$]", con);
                con.Close();
                System.Data.DataTable data = new System.Data.DataTable();
                da.Fill(data);

                List<TopPlayed> daa = new List<TopPlayed>();

                foreach (DataRow p in data.Rows)
                {
                    TopPlayed top = new TopPlayed()
                    {
                        TrackID = Convert.ToInt32(p.Field<double>("TrackID")),
                        Date = p.Field<DateTime>("DateTimes"),
                        TrackName = p.Field<string>("TrackName"),
                        ArtistName = p.Field<string>("ArtistName"),
                        Times = Convert.ToInt32(p.Field<double>("Times"))
                    };
                    daa.Add(top);
                }

                var listOrder = daa.Where(i => i.Date >= Convert.ToDateTime(StartDate) && i.Date <= Convert.ToDateTime(EndDate)).ToList();

                var newlist = listOrder.ToList().GetRange(jtStartIndex, jtPageSize);
                if (!string.IsNullOrWhiteSpace(sorting))
                {
                    newlist = listOrder.OrderByDescending(i => i.Date);
                }

                return Json(new { Result = "OK", Records = newlist, TotalRecordCount = listOrder.ToList().Count });

此电话：

daa.OrderBy(i => i.Date);

不要就地排序数据，必须将结果保存到另一个变量中：

var result = daa.OrderBy(i => i.Date);

此电话：

daa.OrderBy(i => i.Date);

不要就地排序数据，必须将结果保存到另一个变量中：

var result = daa.OrderBy(i => i.Date);

此电话：

daa.OrderBy(i => i.Date);

不要就地排序数据，必须将结果保存到另一个变量中：

var result = daa.OrderBy(i => i.Date);

此电话：

daa.OrderBy(i => i.Date);

不要就地排序数据，必须将结果保存到另一个变量中：

var result = daa.OrderBy(i => i.Date);

---

您在代码中所做的工作需要注意：

public JsonResult TopPlayedInVenueList1(string sorting, string StartDate = "", string EndDate = "", int jtStartIndex = 0, int jtPageSize = 0, string jtSorting = null)
{
    try
    {

        if (Request.IsAuthenticated == true)
        {
            string Path = @"C:\\5Newwithdate-1k.xls";
            OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source= '" + Path + "';Extended Properties=" + (char)34 + "Excel 8.0;IMEX=1;" + (char)34 + "");
            OleDbDataAdapter da = new OleDbDataAdapter("select * from [Sheet1$]", con);
            con.Close();
            System.Data.DataTable data = new System.Data.DataTable();
            da.Fill(data);

            List<TopPlayed> daa = new List<TopPlayed>();

            foreach (DataRow p in data.Rows)
            {
                TopPlayed top = new TopPlayed()
                {
                    TrackID = Convert.ToInt32(p.Field<double>("TrackID")),
                    Date = p.Field<DateTime>("DateTimes"),
                    TrackName = p.Field<string>("TrackName"),
                    ArtistName = p.Field<string>("ArtistName"),
                    Times = Convert.ToInt32(p.Field<double>("Times"))
                };

                //Don't sort inside your foreach!
                //if (sorting != null)
                //{
                //    daa.OrderBy(i => i.Date);
                //}

                daa.Add(top);
            }

            //var listOrder = daa.OrderBy(i => i.Date).ToList().Where(i => i.Date >= Convert.ToDateTime(StartDate) && i.Date <= Convert.ToDateTime(EndDate));
            //Don't run a Where after Orderby, probably you're fine...but not sure its guaruanteed, oh and you probably don't want to sort here either
            //I'm also a little surprised that the Convert statements in there aren't causing runtime errors..
            var listOrder = daa.Where(I => i.Date >= Convert.ToDateTime(StartDate) && i.Date <= Convert.ToDateTime(EndDate)).ToList();

            //you don't need to convert .ToList() to get .Count
            if (jtStartIndex + 150 > listOrder.ToList().Count)
            {
                int val = listOrder.ToList().Count - jtStartIndex;
                jtPageSize = val;
            }

            //This is the list that you actually return. This is where you sort your list
            var newlist = listOrder.OrderBy(i => i.Date).ToList().GetRange(jtStartIndex, jtPageSize);
            return Json(new { Result = "OK", Records = newlist, TotalRecordCount = listOrder.ToList().Count });

---

我会花一点时间仔细检查，确保您实际上也需要所有这些ToList（）。有些看起来…不必要？无论如何，希望这能帮助你解决问题。祝你好运。

你在代码中所做的需要注意：

public JsonResult TopPlayedInVenueList1(string sorting, string StartDate = "", string EndDate = "", int jtStartIndex = 0, int jtPageSize = 0, string jtSorting = null)
{
    try
    {

        if (Request.IsAuthenticated == true)
        {
            string Path = @"C:\\5Newwithdate-1k.xls";
            OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source= '" + Path + "';Extended Properties=" + (char)34 + "Excel 8.0;IMEX=1;" + (char)34 + "");
            OleDbDataAdapter da = new OleDbDataAdapter("select * from [Sheet1$]", con);
            con.Close();
            System.Data.DataTable data = new System.Data.DataTable();
            da.Fill(data);

            List<TopPlayed> daa = new List<TopPlayed>();

            foreach (DataRow p in data.Rows)
            {
                TopPlayed top = new TopPlayed()
                {
                    TrackID = Convert.ToInt32(p.Field<double>("TrackID")),
                    Date = p.Field<DateTime>("DateTimes"),
                    TrackName = p.Field<string>("TrackName"),
                    ArtistName = p.Field<string>("ArtistName"),
                    Times = Convert.ToInt32(p.Field<double>("Times"))
                };

                //Don't sort inside your foreach!
                //if (sorting != null)
                //{
                //    daa.OrderBy(i => i.Date);
                //}

                daa.Add(top);
            }

            //var listOrder = daa.OrderBy(i => i.Date).ToList().Where(i => i.Date >= Convert.ToDateTime(StartDate) && i.Date <= Convert.ToDateTime(EndDate));
            //Don't run a Where after Orderby, probably you're fine...but not sure its guaruanteed, oh and you probably don't want to sort here either
            //I'm also a little surprised that the Convert statements in there aren't causing runtime errors..
            var listOrder = daa.Where(I => i.Date >= Convert.ToDateTime(StartDate) && i.Date <= Convert.ToDateTime(EndDate)).ToList();

            //you don't need to convert .ToList() to get .Count
            if (jtStartIndex + 150 > listOrder.ToList().Count)
            {
                int val = listOrder.ToList().Count - jtStartIndex;
                jtPageSize = val;
            }

            //This is the list that you actually return. This is where you sort your list
            var newlist = listOrder.OrderBy(i => i.Date).ToList().GetRange(jtStartIndex, jtPageSize);
            return Json(new { Result = "OK", Records = newlist, TotalRecordCount = listOrder.ToList().Count });

---

我会花一点时间仔细检查，确保您实际上也需要所有这些ToList（）。有些看起来…不必要？无论如何，希望这能帮助你解决问题。祝你好运。

你在代码中所做的需要注意：

public JsonResult TopPlayedInVenueList1(string sorting, string StartDate = "", string EndDate = "", int jtStartIndex = 0, int jtPageSize = 0, string jtSorting = null)
{
    try
    {

        if (Request.IsAuthenticated == true)
        {
            string Path = @"C:\\5Newwithdate-1k.xls";
            OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source= '" + Path + "';Extended Properties=" + (char)34 + "Excel 8.0;IMEX=1;" + (char)34 + "");
            OleDbDataAdapter da = new OleDbDataAdapter("select * from [Sheet1$]", con);
            con.Close();
            System.Data.DataTable data = new System.Data.DataTable();
            da.Fill(data);

            List<TopPlayed> daa = new List<TopPlayed>();

            foreach (DataRow p in data.Rows)
            {
                TopPlayed top = new TopPlayed()
                {
                    TrackID = Convert.ToInt32(p.Field<double>("TrackID")),
                    Date = p.Field<DateTime>("DateTimes"),
                    TrackName = p.Field<string>("TrackName"),
                    ArtistName = p.Field<string>("ArtistName"),
                    Times = Convert.ToInt32(p.Field<double>("Times"))
                };

                //Don't sort inside your foreach!
                //if (sorting != null)
                //{
                //    daa.OrderBy(i => i.Date);
                //}

                daa.Add(top);
            }

            //var listOrder = daa.OrderBy(i => i.Date).ToList().Where(i => i.Date >= Convert.ToDateTime(StartDate) && i.Date <= Convert.ToDateTime(EndDate));
            //Don't run a Where after Orderby, probably you're fine...but not sure its guaruanteed, oh and you probably don't want to sort here either
            //I'm also a little surprised that the Convert statements in there aren't causing runtime errors..
            var listOrder = daa.Where(I => i.Date >= Convert.ToDateTime(StartDate) && i.Date <= Convert.ToDateTime(EndDate)).ToList();

            //you don't need to convert .ToList() to get .Count
            if (jtStartIndex + 150 > listOrder.ToList().Count)
            {
                int val = listOrder.ToList().Count - jtStartIndex;
                jtPageSize = val;
            }

            //This is the list that you actually return. This is where you sort your list
            var newlist = listOrder.OrderBy(i => i.Date).ToList().GetRange(jtStartIndex, jtPageSize);
            return Json(new { Result = "OK", Records = newlist, TotalRecordCount = listOrder.ToList().Count });

---

我会花一点时间仔细检查，确保您实际上也需要所有这些ToList（）。有些看起来…不必要？无论如何，希望这能帮助你解决问题。祝你好运。

你在代码中所做的需要注意：

public JsonResult TopPlayedInVenueList1(string sorting, string StartDate = "", string EndDate = "", int jtStartIndex = 0, int jtPageSize = 0, string jtSorting = null)
{
    try
    {

        if (Request.IsAuthenticated == true)
        {
            string Path = @"C:\\5Newwithdate-1k.xls";
            OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source= '" + Path + "';Extended Properties=" + (char)34 + "Excel 8.0;IMEX=1;" + (char)34 + "");
            OleDbDataAdapter da = new OleDbDataAdapter("select * from [Sheet1$]", con);
            con.Close();
            System.Data.DataTable data = new System.Data.DataTable();
            da.Fill(data);

            List<TopPlayed> daa = new List<TopPlayed>();

            foreach (DataRow p in data.Rows)
            {
                TopPlayed top = new TopPlayed()
                {
                    TrackID = Convert.ToInt32(p.Field<double>("TrackID")),
                    Date = p.Field<DateTime>("DateTimes"),
                    TrackName = p.Field<string>("TrackName"),
                    ArtistName = p.Field<string>("ArtistName"),
                    Times = Convert.ToInt32(p.Field<double>("Times"))
                };

                //Don't sort inside your foreach!
                //if (sorting != null)
                //{
                //    daa.OrderBy(i => i.Date);
                //}

                daa.Add(top);
            }

            //var listOrder = daa.OrderBy(i => i.Date).ToList().Where(i => i.Date >= Convert.ToDateTime(StartDate) && i.Date <= Convert.ToDateTime(EndDate));
            //Don't run a Where after Orderby, probably you're fine...but not sure its guaruanteed, oh and you probably don't want to sort here either
            //I'm also a little surprised that the Convert statements in there aren't causing runtime errors..
            var listOrder = daa.Where(I => i.Date >= Convert.ToDateTime(StartDate) && i.Date <= Convert.ToDateTime(EndDate)).ToList();

            //you don't need to convert .ToList() to get .Count
            if (jtStartIndex + 150 > listOrder.ToList().Count)
            {
                int val = listOrder.ToList().Count - jtStartIndex;
                jtPageSize = val;
            }

            //This is the list that you actually return. This is where you sort your list
            var newlist = listOrder.OrderBy(i => i.Date).ToList().GetRange(jtStartIndex, jtPageSize);
            return Json(new { Result = "OK", Records = newlist, TotalRecordCount = listOrder.ToList().Count });

---

---

我会花一点时间仔细检查，确保您实际上也需要所有这些ToList（）。有些看起来…不必要？无论如何，希望这能帮助你解决问题。祝你好运。

谢谢-我尝试了你的建议，但没有成功。我已经用你的代码更新了我的帖子。如果（排序！=null）{daa=daa.OrderBy（I=>I.Date）；}？我已经在顶部定义了

daa

列表

变量，所以它不会接受它。默认情况下，它会对表进行排序（ASC/DESC），这很好，但是当单击表标题对列进行排序时，它什么也不做。谢谢-我尝试了您的建议，但没有成功。我已经用你的代码更新了我的帖子。如果（排序！=null）{daa=daa.OrderBy（I=>I.Date）；}？我已经在顶部定义了

daa

列表

变量，所以它不会接受它。默认情况下，它会对表进行排序（ASC/DESC），这很好，但是当单击表标题对列进行排序时，它什么也不做。谢谢-我尝试了您的建议，但没有成功。我已经用你的代码更新了我的帖子。如果（排序！=null）{daa=daa.OrderBy（I=>I.Date）；}？我已经在顶部定义了

daa

列表

变量，所以它不会接受它。默认情况下，它会对表进行排序（ASC/DESC），这很好，但是当单击表标题对列进行排序时，它什么也不做。谢谢-我尝试了您的建议，但没有成功。我已经用你的代码更新了我的帖子。如果（排序！=null）{daa=daa.OrderBy（I=>I.Date）；}？我已经在顶部定义了

daa

列表

变量，所以它不会接受它。默认情况下，它会对表进行排序（ASC/DESC），这很好，但是当单击表标题对列进行排序时，它不会做任何事情。首先，感谢您抽出时间编写代码并帮助我。您的代码更有意义，更易于理解，因为我对C#还相当陌生。我尝试了您的代码，但它给出了以下错误

此行已存在显式转换
newlist=listOrder.OrderByDescending（I=>I.Date）我已经用你的代码更新了上面的代码供你检查，再次感谢你：）还有@Mike，我默认按行排序，这很好。。但是，当我单击表标题时，它不会对列进行排序。单击时，排序箭头会上下移动，但数据保持不变。。再次感谢您的时间、努力和帮助：）好的，我还没有测试过这段代码。我猜（这有点可笑）您需要在末尾添加.ToList（）。我会用这个更新我的帖子。你的第二个评论很难理解。第1步是验证此函数是否按照您想要的顺序返回列表。如果这是真的，那么问题不在这里，而是在你看来。很抱歉，我不清楚，我可以对列进行排序，但标题排序不起作用。再一次为混淆感到抱歉。首先感谢您抽出时间来处理代码并帮助我解决问题。您的代码更有意义，更易于理解，因为我对C#还相当陌生。我尝试了您的代码，但它给出了以下错误
此行已存在显式转换
newlist=listOrder.OrderByDescending（I=>I.Date）我已经用你的代码更新了上面的代码供你检查，再次感谢你：）还有@Mike，我默认按行排序，这很好。。但是，当我单击表标题时，它不会对列进行排序。单击时，排序箭头会上下移动，但数据保持不变。。再次感谢您的时间、努力和帮助：）好的，我还没有测试过这段代码。我猜（这有点可笑）您需要在末尾添加.ToList（）。我会用这个更新我的帖子。你的第二个评论很难理解。第1步是验证此函数是否按照您想要的顺序返回列表。如果这是真的，那么问题不在这里，而是在你看来。很抱歉，我不清楚，我可以对列进行排序，但标题排序不起作用。再次抱歉