在ForEach循环中连接字符串 [英] Concatenate Strings In ForEach Loop

问题描述

我想为每个循环迭代两次，并将值连接成一个字符串。  我有以下语法，但我的问题是数据被追加两次。

I want to iterate two for each loops and concatenate the values into one string.  I have the below syntax, but my issue is that the data is appended twice.

我应该如何写这个不同的数据，以便只写一次数据？

How should I write this differently so that the data is only written one time?

DataTable table = new DataTable();
table.Columns.Add("Name", typeof(string));
table.Columns.Add("ItemsSold", typeof(string));
table.Columns.Add("ItemIDs, typeof(string));
table.Rows.Add("James Jo", "Shirt; Hat; Socks;", "SH11; HA22; SO33");

var itemsSold = table.Rows[0].Field<string>("ItemsSold").Split(new string[] {"; "}, StringSplitOptions.RemoveEmptyEntries);
var ItemIDs = table.Rows[0].Field<string>("ItemIDs").Split(new string[] {"; "}, StringSplitOptions.RemoveEmptyEntries);

string displayformat = "";

foreach (string is in itemsSold)
{
    foreach (string id in ItemIDs)
    {
        string s = is.Replace(";", "");
        string d = id.Replace(";", "");
        displayformat += s + " - " + d + Environment.NewLine;
    }
}

Console.WriteLine(displayformat);

Will write - 
Shirt - SH11
Hat - HA22
Socks - SO33
Shirt - SH11
Hat - HA22
Shirt - SH11

推荐答案

这里

DataTable table = new DataTable();
table.Columns.Add("Name", typeof(string));
table.Columns.Add("ItemsSold", typeof(string));
table.Columns.Add("ItemIDs", typeof(string));
table.Rows.Add("James Jo", "Shirt; Hat; Socks;", "SH11; HA22; SO33");

var itemsSold = table.Rows[0].Field<string>("ItemsSold").Split(new string[] { "; " }, StringSplitOptions.RemoveEmptyEntries);
var ItemIDs = table.Rows[0].Field<string>("ItemIDs").Split(new string[] { "; " }, StringSplitOptions.RemoveEmptyEntries);


var sb = new StringBuilder();
for (int index = 0; index < itemsSold.Length; index++)
{
    sb.AppendLine(

" {itemsSold [index ]} - {ItemIDs [index]}"）;
}

var displayFormat = sb.ToString（）;

"{itemsSold[index]} - {ItemIDs[index]}"); } var displayFormat = sb.ToString();

编辑如果不使用当前版本然后尝试这个框架。

Edit If not using a current version of the Framework then try this too.

DataTable table = new DataTable();
table.Columns.Add("Name", typeof(string));
table.Columns.Add("ItemsSold", typeof(string));
table.Columns.Add("ItemIDs", typeof(string));
table.Rows.Add("James Jo", "Shirt; Hat; Socks;", "SH11; HA22; SO33");

var itemsSold = table.Rows[0].Field<string>("ItemsSold").Split(new string[] { "; " }, StringSplitOptions.RemoveEmptyEntries);
var ItemIDs = table.Rows[0].Field<string>("ItemIDs").Split(new string[] { "; " }, StringSplitOptions.RemoveEmptyEntries);


var sb = new StringBuilder();
for (int index = 0; index < itemsSold.Length; index++)
{
    sb.AppendLine(itemsSold[index] + " - " + ItemIDs[index]);   

}

var displayFormat = sb.ToString();
Console.WriteLine(displayFormat);

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