如何添加字典 <string,List<string> &gt;到C＃中的数据表？

Question

I need to add Dictionary<string,List<string>> contents to a Data Table in C#. The Header column name should be the Key in Dictionary and the rows should be the List<string> contents. How can I get it?

Code:

DataTable new_dt = new DataTable();

//Header Columns
foreach (string item in splits)
{
    DataColumn col = new DataColumn(item, typeof(System.String));
    new_dt.Columns.Add(col);
}

foreach (DataColumn col in new_dt.Columns)
{
    //Declare the bound field and allocate memory for the bound field.
    BoundField bfield = new BoundField();

    //Initalize the DataField value.
    bfield.DataField = col.ColumnName;

    //Initialize the HeaderText field value.
    bfield.HeaderText = col.ColumnName;

    //Add the newly created bound field to the GridView.
    gvMatrix.Columns.Add(bfield);
}

//Content Loading
foreach (KeyValuePair<string, List<string>> item in _dict)
{
    string[] ss = item.Value.ToArray();

    foreach (string s in ss)
    {
        DataRow row = new_dt.NewRow();
        row[item.Key] = s;
        new_dt.Rows.Add(row);
    }
}

gvMatrix.DataSource = new_dt;
gvMatrix.DataBind();

Answer 1

This should work:

        Dictionary<string, List<string>> dict = new Dictionary<string, List<string>>();
        int rowcount = table.Rows.Count;
        int columnCount = table.Columns.Count;

        for (int c = 0; c <= columnCount; c++)
        {
            string columnName = table.Columns[c].ColumnName;
            List<string> tempList = new List<string>();

            for (int r = 0; r <= rowcount; r++)
            {
                var row = table.Rows[r];
                if (row[c] != DBNull.Value)
                    tempList.Add((string)row[c]);
                else
                    tempList.Add(null);
            }
            dict.Add(columnName, tempList);
        }

But as others have mentioned, it isn't a really good idea to convert a datatable into a dictionary.The columns having different lenghts as mentioned in the comments aren't really a problem normally as you can't add values to columns, you can only add rows to a table of which you defined the columns. If you don't give a value to a certain column in the row, then it will contain DBNull.Value , if you haven't set the column to AllowDBNull = true you will get an error if you don't fill in one of the columns. So there will never be columns with more rows than the other ones because that's impossible.