Question

我在将产品对象转换为csv字符串时遇到问题。

var data = ProductPresenter.ExportAllProducts();
string csv = String.Join(",", data.Select(x => x.ToString()).ToArray());

这会产生以下输出：

BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts,BLL.Views.ExportAllProducts

预期输出将如下：

Small Hat, 12.10, true
Medium Hat, 13.50, true
Large Hat, 15.00, false
...

我错过了什么转换来获取对象上每个项目的值？

Answer 1

您的数据变量不是字符串列表，要么将.ToString（）方法添加到该类，要么创建字符串列表并使用它。

Answer 2

您需要覆盖ToString()方法才能获得所需的效果。否则，当您执行ToString()时，将使用基础“对象”类中x.ToString()的实现。

Object.ToString()返回您的对象所属的类的全名。

Answer 3

我认为您正在尝试以csv格式获取字符串列表/数组。

我会覆盖ToString()

class Product
{
    public override string ToString()
    {
        return ProductName + "," + Price.ToString() + "," + boolProperty.ToString();
    }
}

和

var q = (from d in data select d.ToString()).ToArray()

或类似

var q = (from d in data 
        select new { d.ProductName + "," + Price.ToString() +
               "," + boolProperty.ToString() } )
        .ToArray()

将对象转换为CSV字符串

3 个答案: