'object'不包含'NewRow'的定義，並且沒有可以找到接受'object'類型的第一個參數的擴展方法'NewRow'

Question

我在行中出現錯誤.Error是Viewstate [「dt」]用作對象和行不包含定義對象

protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e) 
{ 
    string Row = e.RowIndex.ToString();   
    DataRow dtrow = default(DataRow); 
    dtrow = ViewState["dt"].Rows[Row]; 
    ViewState["dt"].Rows.Remove(dtrow); 
    GridView1.DataSource = ViewState["dt"]; 
    GridView1.DataBind(); 
    CalculateItemNetAmount(); 
} 

Answer 1

你應該投你ViewState["dt"]成DataTable第一。

protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e) 
{ 
    string Row = e.RowIndex.ToString();   
    DataRow dtrow = default(DataRow); 
    var dataTable = (DataTable)ViewState["dt"]; 
    dtrow = dataTable .Rows[Row]; 
    dataTable.Rows.Remove(dtrow); 
    GridView1.DataSource = dataTable; 
    GridView1.DataBind(); 
    CalculateItemNetAmount(); 
} 

Answer 2

這是因爲ViewState["dt"]是object類型。你需要訪問它的Rows財產一樣

((DataTable)ViewState["dt"]).Rows[Row];