方法名称预期 [英] Method Name Expected

问题描述

  private   static   void  ListStudentsCountAgeWise（List< DataRow> listofStudents）
 {
 Dictionary< int，List <  DataRow>> agewisestudentscount =  new  Dictionary< int，List< DataRow>>（）; 
  foreach （DataRow dr  in  listofStudents）
 {
  if （agewisestudentscount  //   MethodName Exepected.Keys.Contains。（dr [年龄]）） 
 agewisestudentscount（dr [ 年龄 ]）= agewisestudentscount（dr [ 年龄]）+  1 ; 
  else  
 agewisestudentscount（dr [ 年龄]）=  1 ; 
} 
 
 Console.WriteLine（  Age \tCount）; 
  foreach （ int  key  in  agewisestudentscount.Keys）
 {
 Console.WriteLine（key +   \t + agewisestudentscount [key]）; 
} 

解决方案

您的字典声明及其用法看起来不对请参阅词典（TKey，TValue）类（System.Collections.Generic） [ ^ ]。

         private static void ListStudentsCountAgeWise(List<DataRow> listofStudents)
{
    Dictionary<int, List < DataRow >> agewisestudentscount = new Dictionary<int, List<DataRow>>();
    foreach (DataRow dr  in listofStudents)
    {
        if (agewisestudentscount//MethodName Exepected.Keys.Contains.(dr["Age"]))
            agewisestudentscount(dr["Age"]) = agewisestudentscount(dr["Age"]) + 1;
        else
            agewisestudentscount(dr["Age"]) = 1;
    }

    Console.WriteLine("Age\tCount");
    foreach (int key in agewisestudentscount.Keys)
    {
        Console.WriteLine(key + "\t" + agewisestudentscount[key]);
    }

解决方案

Your Dictionary declaration, and its usage both look incorrect. See Dictionary(TKey, TValue) Class (System.Collections.Generic)[^].

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