Question

dropdownlist控件使用问题。

怎么在DropDownList2_SelectedIndexChanged事件中获取DropDownList1_SelectedIndexChanged中的isRunNian属性啊?如果isRunNian为真的话，当月份是二月的时候daysOfMonth就赋值为29.请大神帮帮忙！！
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
Boolean isRunNian = false;
int year = (int)(Convert.ToInt32(DropDownList1.SelectedItem.Value.ToString()));
if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
isRunNian = true;
}
protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
{
int daysOfMonth;
int month = (int)(Convert.ToInt32(DropDownList2.SelectedItem.Value.ToString())); ;
if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month ==12)
daysOfMonth = 31;
else if (month == 2)
{
if(DropDownList1_SelectedIndexChanged().isRunNian==true)
}
}

Answer 1

你可以把isRunNian设为全局的变量啊，写到这两个事件函数的外面。

private boolean isRunNian = false; //移到到外面来

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        int year = (int)(Convert.ToInt32(DropDownList1.SelectedItem.Value.ToString()));
        if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
            isRunNian = true;
    }
    protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
    {
        int daysOfMonth;
        int month = (int)(Convert.ToInt32(DropDownList2.SelectedItem.Value.ToString())); ;
        if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month ==12)
            daysOfMonth = 31;
        else if (month == 2)
        { 
        if(isRunNian)  //这里判断
           daysOfMonth = 29;
        }
    }

希望能帮到你 : )

Answer 2

把Boolean isRunNian当做一个字段或属性，DropDownList2_SelectedIndexChanged就可以获取了

追问

哦，我也是这样想的，但是DropDownList1_SelectedIndexChanged()括号里面的东西怎么写呢？

追答

括号里面写
DropDownList1_SelectedIndexChanged(null,null)
或者DropDownList1_SelectedIndexChanged(sender,e)