C# 过滤数据表的最佳方式是什么？

在我的一个c#需求中，我有一个datatable，其中包含以下数据

Category Topics Resourceworked 
A        tp1    Hemant
A        tp2    Kevin
B        tp3    Haris
B        tp4    Hemant
B        tp5    Hemant
C        tp6    Kevin

在输出中，我需要两组数据

输出-1：对于每个独特的类别，有多少资源起作用

Category  NoOfResorces
A         2
B         2
C         1

输出-2：resorces为不安静类别（如）工作了多少次

Category  Resource   NoOfTime
A         Hemant     1
A         Kevin      1
B         Haris      1
B         Hemant     2
C         Kevin      1

实现输出（即数据表过滤器或LINQ）的最佳方法是什么

补充：

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任何LINQ专家都能告诉我学习LINQ的好的在线网站或书籍吗？

以下是您的第一个要求：

var uniqueCat = from d in tblData.AsEnumerable()
                group d by (string)d["Category"] into Group
                select Group;
var catRes = from grp in uniqueCat
             let c = grp.Select(r => r["Resourceworked"]).Distinct().Count()
             select new {Category = grp.Key, NoOfResorces=c};

var summary = from cr in catRes
         select string.Format("Category:{0} Count:{1}",cr.Category,cr.NoOfResorces);
MessageBox.Show(string.Join(Environment.NewLine,summary));

这是第二个查询：

var uniqueCatRes = from d in tblData.AsEnumerable()
                   group d by new{Cat= d["Category"], Res=d["Resourceworked"]} into Group 
                   select Group;
var catResCount = from grp in uniqueCatRes
                  let Category = grp.Key.Cat
                  let Resource = grp.Key.Res
                  let NoOfResorces = grp.Count()
                  select new { Category,Resource,NoOfResorces };

summary = from crc in catResCount
          select string.Format("Category:{0} Resource:{1} Count:{2}", crc.Category,crc.Resource, crc.NoOfResorces);
MessageBox.Show(string.Join(Environment.NewLine,summary));

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这是您的第一个要求：

var uniqueCat = from d in tblData.AsEnumerable()
                group d by (string)d["Category"] into Group
                select Group;
var catRes = from grp in uniqueCat
             let c = grp.Select(r => r["Resourceworked"]).Distinct().Count()
             select new {Category = grp.Key, NoOfResorces=c};

var summary = from cr in catRes
         select string.Format("Category:{0} Count:{1}",cr.Category,cr.NoOfResorces);
MessageBox.Show(string.Join(Environment.NewLine,summary));

这是第二个查询：

var uniqueCatRes = from d in tblData.AsEnumerable()
                   group d by new{Cat= d["Category"], Res=d["Resourceworked"]} into Group 
                   select Group;
var catResCount = from grp in uniqueCatRes
                  let Category = grp.Key.Cat
                  let Resource = grp.Key.Res
                  let NoOfResorces = grp.Count()
                  select new { Category,Resource,NoOfResorces };

summary = from crc in catResCount
          select string.Format("Category:{0} Resource:{1} Count:{2}", crc.Category,crc.Resource, crc.NoOfResorces);
MessageBox.Show(string.Join(Environment.NewLine,summary));

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是否可以将摘要转换为数据表？我收到一些类型转换错误。是否可以将摘要转换为数据表？我收到一些打字错误。