Request为null求原因
前台代码:<input id="dropClass" class="easyui-combobox" data-options="valueField:'GradeID',textField:'GradeName',url:'Default.aspx?action=ClassList'" />
后台获取:protected void Page_Load(object sender, EventArgs e)
{
string Action;
string OutStr = "";
if (!IsPostBack)
{
Action = Request.QueryString["action"].ToLower();
switch (Action.ToLower())
{
case "classlist":
OutStr = ClassList();
break;
}
}
}
调试出现错误 Action为null,未将对象引用设置到对象的实例。