筛选具有多列的DataView [英] Filtering DataView with multiple columns

问题描述

在我的应用程序中，我正在使用一个dataview来应用要应用的过滤器，其中过滤器选项是动态传递的。如果有2个过滤器参数，则应为data1过滤dataview，然后通过参数2过滤。我正在使用一种在for循环中调用的方法，其中我将计数设置为使用列表框选择的参数总数，但仅对最后一个参数进行过滤。
这是我的代码：

In my application I am using a dataview for having the filters to be applied where the filter options are passed dynamically.if there are 2 filter parameters then the dataview should be filtered for parameter1 and then by parameter two. I am using a method which is called in a for loop where I am setting the count to the total no.of parameters selected using a listbox but the filtering is done only for the last parameter. Here is my code:

string str = "";
for (int i = 0; i < listbox.Items.Count; i++)
{
    if (listbox.Items[i].Selected)
    {
        if (str != string.Empty)
        {
            str = str + "," + listbox.Items[i].Text;

        }
        else
        {
            str = str + listbox.Items[i].Text;
        }
    }
}

string[] items = str.Split(',');
for (int i = 0; i < items.Length; i++)
{
    ApplyFilter(items[i],dv);
}

private DataView ApplyFilter(string str,DataView newdv)
{
    newdv.RowFilter = "[" + str + "]=" + ddl.SelectedItem.ToString();

    return newdv;
}

请提供合适的解决方案。

Please provide a suitable solution .

预先感谢...

推荐答案

您应该完全应用过滤器，而不是一个一个地应用：

You should apply your filter altogether, not one by one :

newdv.RowFilter = "Column1 = " + value1 + " AND Column2 = " + value2;

因此您可以将代码更改为：

So you can change your code as :

string[] items = str.Split(',');
string filter = string.Empty;
for (int i = 0; i < items.Length; i++)
{
    filter += items[i] + " = " + dropdown.SelectedValue;
    if (i != items.Length - 1)
    {
         filter += " AND ";
    }
}
newdv.RowFilter = filter;

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