如何在使用foreach循环时添加到数据集中的特定列c＃

Question

I'm trying to add an incrementing time! column to my datagrid view along side the data that is being pulled from the streamreader 'r'; I have the increment working but the time goes between the rows rather than next to them. The data is being displayed as followed:

15:46:20
91 154 70 309 83 6451

15:46:21
91 154 70 309 83 6451

When I want to get it to be like this: 15:46:21 91 154 70 309 83 6451

                while ((r.Peek() != -1))
                {
                    string timeS = "";
                    string delimeter = "\t";
                    string[] Time1;
                    allData = r.ReadLine();
                    timeS = Dtime.ToString();
                    Time1 = timeS.Split(' ');
                    timeS = Time1[1];


                    string[] rows = allData.Split("\r".ToCharArray());

                    foreach (string row in rows)
                    {
                        Dtime = Dtime.AddSeconds(inter);
                        dataset.Tables[tableName].Rows.Add(timeS);
                        string[] items = row.Split(delimeter.ToCharArray());

                        dataset.Tables[tableName].Rows.Add(items);


                    }

                    this.dataGridView1.DataSource = dataset.Tables[0].DefaultView;
                }

Cheers!

Answer 1

I think the issue is this:

dataset.Tables[tableName].Rows.Add(timeS);

Followed by:

dataset.Tables[tableName].Rows.Add(items);

So that's why there are two rows being added.

There's a nicer way to do this though. It sounds as though you want to dynamically added another column to hold the time value. Is this defined in your data table, or do you add it at run time? Either way, it needs to be there in order to hold the value.

I modified your code above to get the time value into the last position in the item array. It's not pretty at all, and could be simplified dramatically. Here's my code:

string timeS = "Time";
string row = "Value1,Value2,Value3";
string delimeter = ",";
string[] items = row.Split(delimeter.ToCharArray());
string[] newItems = new string[items.Length + 1];

items.CopyTo(newItems, 0);
newItems[newItems.Length - 1] = timeS;

So now you have an array where the last item is the time value. You can add this into your data table:

dataTable.Rows.Add(newItems);

I'm sure there's a nicer way to do this, perhaps this will help you get moving in the right direction.

Answer 2

Instead of adding timeS as a new row by itself, you should add it as the first item in your items array, and then add the array as a row.

For example:

var items = new List<string>{timeS};
items.AddRange(row.Split(delimeter.ToCharArray()));                
dataset.Tables[tableName].Rows.Add(items.ToArray());