c# – 解决“不包含’OfType’的定义”错误消息？

发布时间：2020-12-15 04:29:15 所属栏目：百科来源：网络整理

导读：这是我的代码并出现未知错误： private void dataGridView1_CellValueChanged(object sender,DataGridViewCellEventArgs e){ for (int i = 0; i dataGridView1.Rows.Count; ++i) { object a = dataGridView1.Rows[i].Cells["price"].Value; object b = dataG

这是我的代码并出现未知错误：

private void dataGridView1_CellValueChanged(object sender,DataGridViewCellEventArgs e)
{
        for (int i = 0; i < dataGridView1.Rows.Count; ++i)
        {

            object a = dataGridView1.Rows[i].Cells["price"].Value;
            object b = dataGridView1.Rows[i].Cells["tedad"].Value;
            double aNumber = 0;
            double bNumber = 0;
            if (a != null)
                aNumber = Double.Parse(a.ToString());
            if (b != null)
                bNumber = Double.Parse(b.ToString());
            dataGridView1.Rows[i].Cells["total"].Value = aNumber * bNumber;
            dataGridView1.RefreshEdit();
        }
        decimal sum = dataGridView1.Rows.OfType<DataGridViewRow>()
           .Sum(row => Convert.ToDecimal(row.Cells["total"].Value));
        txtDate.Text  = sum.ToString();

像OfType()这样的错误：

‘System.Windows.Forms.DataGridViewRowCollection’ does not contain a definition for ‘OfType’ and no extension method ‘OfType’ accepting a first argument of type ‘System.Windows.Forms.DataGridViewRowCollection’ WindowsFormsApplication1test

解决方法

确保你有：

using System.Linq;

Enumerable.OfType Method

>命名空间：System.Linq>程序集：System.Core(在System.Core.dll中)

（编辑：李大同）

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