我正在使用复选框更新整数值. [英] I'm updating an integer value with a checkbox.

问题描述

我正在使用这段代码来尝试使用复选框更新数据库中的整数值.当我使用类的对象调用更新方法时，它在按钮后面的代码上给了我一个错误

I''m having this code seeking to update an integer value on database using a checkbox. it give me an error on code behind the button when i use the object of class to call the update method

//this is my my business logic
public class CastVote
    {
       public Int32 id { get; set; }
       public Int32  [] cast { get; set; }
        
       public CastVote()
       {
       id=0;
       cast=null;
       }

       public CastVote(Int32 _id, int [] _cast) 
       {
           id = _id;
           cast = _cast;
       }

       public void Votes(Int32 id) 
       {
           csDAL objdal = new csDAL();
           List<csParameterListType> objlist = new List<csParameterListType>();
           objlist.Add(new csParameterListType("@id", System.Data.SqlDbType.Int, id));
           objdal.executespreturnnd("cast_vote", objlist);
       }
    }

//code behind the button
                StringCollection idCollection = new StringCollection();
                string  strid = string .Empty ;
                //loop through gridview to find checked rows
                for (int i = 0; i < GridView1.Rows.Count; i++) 
                {
                    CheckBox chckupdate = (CheckBox)GridView1.Rows[i].Cells[0].FindControl("chckhere");
                    if (chckupdate != null) 
                    {
                        if (chckupdate.Checked)
                        {
                            strid = GridView1.Rows[i].Cells[1].Text;
                            idCollection.Add(strid);
                        }
                    }
                }
                if (idCollection.Count >= 0)
                {
                    BLL.CastVote obj = new CastVote();
                    obj.id = Convert.ToInt32(idCollection.Count);
                    obj.Votes(); 
                   //it give an error here
               
                }
                else 
                {
                    //lblmsg.Text = "Please select your favourate candidates";
                }
            }

推荐答案

obj.id = Convert.ToInt32(idCollection.Count);

Convert.ToInt32是不必要的，因为StringCollection或任何集合的Count属性已经是整数.

您需要缩小一点，抛出的异常是什么?

The Convert.ToInt32 is unnecessary since the Count property of the StringCollection, or any collection, is already an integer.

You need to narrow it down a bit, what is the exception that is being thrown?

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