foreach在foreach中依次做第二次foreach

Question

我需要在foreach轮流中使用du foreach，做第二次foreach，然后做第一次foreach并做第二次foreach两次

foreach (var name in xml.Root.DescendantNodes().OfType<XElement>()
    .Select(x => x.Name).Distinct())
    {

        StringWriter sw = new StringWriter();
        XmlTextWriter tx = new XmlTextWriter(sw);
        string str = name.ToString();


        foreach (var name1 in xml.Root.DescendantNodes().OfType<XElement>()
            .Select(x => x.Value).Distinct())
            {
                column = new WebGridColumn();
                column.ColumnName = str;
                StringWriter sw1 = new StringWriter();
                XmlTextWriter tx1 = new XmlTextWriter(sw1);
                string str1 = name1.ToString();

                column.Format = (item) => str1;

                listelem.Add(column);
                break;
            }

        }

Answer 1

使用像这样的bool标志

        int counter = 0;
        foreach (var name in xml.Root.DescendantNodes().OfType<XElement>()
                                           .Select(x => x.Name).Distinct())
        {
            StringWriter sw = new StringWriter();
            XmlTextWriter tx = new XmlTextWriter(sw);
            string str = name.ToString();
            int localCounter = -1;
            {
            foreach (var name1 in xml.Root.DescendantNodes().OfType<XElement>()
                 .Select(x => x.Value).Distinct())
            {
                localCounter++;
                if(localCounter < counter)
                   {

                     continue;
                    }
               counter++;
                column = new WebGridColumn();
                column.ColumnName = str;
                StringWriter sw1 = new StringWriter();
                XmlTextWriter tx1 = new XmlTextWriter(sw1);
                string str1 = name1.ToString();

                column.Format = (item) => str1;

                listelem.Add(column);
                break;
            }
            }

        }