如何填充列表℃的数据表; T＆GT; [英] How to fill a datatable with List<T>

问题描述

列表如何转换成一个DataTable

How can convert a list to a datatable

[Serializable]
public class Item
{
    public string Name { get; set; }
    public double Price { get; set; }
    public string @URL { get; set; }

    public Item(string Name, string Price, string @URL)
    {
        this.Name = Name;
        this.Price = Convert.ToDouble(Price);
        this.@URL = @URL;
    }

    public override string ToString()
    {
        return this.Name;
    }
}

我试着使用：

I tried using:

static DataTable ConvertToDatatable(List<Item> list)
{
    DataTable dt = new DataTable();

    dt.Columns.Add("Name");
    dt.Columns.Add("Price");
    dt.Columns.Add("URL");
    foreach (var item in list)
    {
        dt.Rows.Add(item.Name, Convert.ToString(item.Price), item.URL);
    }

    return dt;
}

现在，我得到一个箱子出现，但其空！帮帮我！！我能做些什么，使箱子居然有数据吗？

Now I'm getting a box show up but its empty! Help!! What can i do to make the box actually have data?

推荐答案

以防万一你有一个可为空属性类对象：

Just in case you have a nullable property in your class object:

private static DataTable ConvertToDatatable<T>(List<T> data)
        {
            PropertyDescriptorCollection props =
                TypeDescriptor.GetProperties(typeof(T));
            DataTable table = new DataTable();
            for (int i = 0; i < props.Count; i++)
            {
                PropertyDescriptor prop = props[i];
                if (prop.PropertyType.IsGenericType && prop.PropertyType.GetGenericTypeDefinition() == typeof(Nullable<>))
                    table.Columns.Add(prop.Name, prop.PropertyType.GetGenericArguments()[0]); 
                else
                    table.Columns.Add(prop.Name, prop.PropertyType);
            }
            object[] values = new object[props.Count];
            foreach (T item in data)
            {
                for (int i = 0; i < values.Length; i++)
                {
                    values[i] = props[i].GetValue(item);
                }
                table.Rows.Add(values);
            }
            return table;
         }

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