C＃：綁定字典 <string, List<string> &gt;到數據表

Question

我有一本字典

Dictionary<string, List<string>> first=new Dictionary<string, List<string>>();

我想將此字典綁定到數據表，以便數據表ColumnName應該是字典的鍵，並且各個列應包含其字典值。 我試過的

Dictionary<string, List<string>> some= new Dictionary<string, List<string>>();
 System.Data.DataTable dt = new System.Data.DataTable();
            foreach (var entry in some)
            {
                if (entry.Value.Count > 0)
                {
                    dt.Columns.Add(entry.Key); 
                    //entry.Value.count is not same for all entry.Key                 
                    foreach (var value in entry.Value)
                    {
                        DataRow row = dt.NewRow();
                        row[entry.Key] = value;
                        dt.Rows.Add(row);
                    }
                }              
            }

我當然知道，以上代碼在實現以下結果DesirrdResultImage時有一些錯誤嗎？

Answer 1

這是一個可能的解決方案（請注意，我認為這不是實現此目的的最佳方法，但我希望它會為您提供指導）：

Dictionary<string, List<string>> some = new Dictionary<string, List<string>>
{
    { "Key1", new List<string>
        {
            "Val1_1",
            "Val2_1",
            "Val3_1"
        }
    },
    { "Key2", new List<string>
        {
            "Val1_2",
            "Val2_2",
            "Val3_2"
        }
    }
};

DataTable dt = new DataTable();
var keys = some.Keys;

// Add all the columns from the beginning
dt.Columns.AddRange(keys.Select(key => new DataColumn(key)).ToArray());
// Get the rows number using the Max count of the lists (assuming the length of the lists might change, otherwise just use some.Values[0].Count)
int rowsNumber = some.Values.Max(s => s.Count);

for (int i = 0; i < rowsNumber; i++)
{
    var row = dt.NewRow();

    // Set all the values depending on the keys
    foreach (var key in keys)
    {
        if (some[key].count <= i)
            break;

        row[key] = some[key][i];
    }

    dt.Rows.Add(row);
}

dataGridView1.DataSource = dt;

結果是：

Answer 2

檢查是否沒有行或少於“將值添加到新行的值”，否則將值添加到現有行

        DataTable dt = new DataTable();
        int i = 0;
        foreach (var entry in some)
        {
            if (entry.Value.Count > 0)
            {
                dt.Columns.Add(entry.Key);
                DataRow row;
                //entry.Value.count is not same for all entry.Key                 
                foreach (var value in entry.Value)
                {

                    int ValueCount = entry.Value.Count();
                    if (dt.Rows.Count <= ValueCount)
                    {
                        row = dt.NewRow();
                        row[entry.Key] = value;
                        dt.Rows.Add(row);
                    }
                    else
                    {
                        row = dt.Rows[i];
                        row[entry.Key] = value;
                        i++;
                    }

                }

            }
        }