[英]How to join Jagged array with separator using string.Join?
我怎樣才能解決下面的字符串連接錯誤。 我將int值轉換為字符串值但發生錯誤....查看Join方法
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
namespace SortArrayYusuf
{
class Program
{
static void Main(string[] args)
{
//int[] array;
//using (DataTable table = GetTable())
//{
// array = (from DataRow row in table.Rows
// select
// (from DataColumn col in table.Columns
// select row[col].ToString().Length).Sum()).ToArray();
//}
//foreach (int value in array)
// Console.WriteLine(value);
int[][] lengths;
using (DataTable table = GetTable())
{
lengths = (from DataRow row in table.Rows
select
(from DataColumn col in table.Columns
select row[col].ToString().Length).ToArray()).ToArray();
}
foreach (int[] row in lengths)
{
Console.WriteLine(string.Join(", ", row.ToString()));
}
Console.ReadKey();
}
static DataTable GetTable()
{
//
// Here we create a DataTable with four columns.
//
DataTable table = new DataTable();
table.Columns.Add("Dosage", typeof(int));
table.Columns.Add("Drug", typeof(string));
table.Columns.Add("Patient", typeof(string));
table.Columns.Add("Date", typeof(DateTime));
//
// Here we add five DataRows.
//
table.Rows.Add(25, "Indocin", "David", DateTime.Now);
table.Rows.Add(50, "Enebrel", "Sam", DateTime.Now);
table.Rows.Add(10, "Hydralazine", "Christoff", DateTime.Now);
table.Rows.Add(21, "Combivent", "Janet", DateTime.Now);
table.Rows.Add(100, "Dilantin", "Melanie", DateTime.Now);
return table;
}
}
}
foreach (int[] row in lengths) { Console.WriteLine(string.Join(", ", row.ToString())); }
Console.WriteLine(string.Join(", ", row.Select(x => x.ToString()).ToArray()));
你只想要所有的價值觀? 然后SelectMany
可能會有所幫助。 如果您使用的是.NET 4,那么還有一個Join
重載也可以在這里提供幫助(采用序列而不是數組,因此您不需要創建額外的單個數組,或者使用StringBuilder
):
int[][] arr = { new[] {1,2,3}, new[] {4}, new[] {5,6}};
string s = string.Join(",", arr.SelectMany(row => row));
返回"1,2,3,4,5,6"
。
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