问题请教.请指点
[NullReferenceException: 未将对象引用设置到对象的实例。]
Manage_AddProduct_Question.BindddlProduct() in e:\vss\AocLife\Source\prototype\AocLife\AocLife\Manage\AddProduct_Question.aspx.cs:36
Manage_AddProduct_Question.Page_Load(Object sender, EventArgs e) in e:\vss\AocLife\Source\prototype\AocLife\AocLife\Manage\AddProduct_Question.aspx.cs:22
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +34
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +47
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +106
protected void Page_Load(object sender, EventArgs e)
{
Power.Judge(this);
if (!IsPostBack)
{
BindddlProduct();
bindQuestion(Convert.ToInt32(ddlProduct.SelectedValue));
}
}
private void BindddlProduct()
{
ProductBL ProductBL = new ProductBL();
SqlDataReader dr = ProductBL.SelectProduct();
ddlProduct.DataSource = dr;
ddlProduct.DataTextField = "ProductName ";
ddlProduct.DataValueField = "ProductKey ";
ddlProduct.DataBind();
dr.Close();
ddlProduct.Items.FindByValue(GetProductKey().ToString()).Selected=true; 这句话报错
}
private void bindQuestion(int ProductKey)
{
QuestionBL questionBL = new QuestionBL();
SqlDataReader sdr = questionBL.NotinProductQuestion(ProductKey);
ddlQuestion.DataSource = sdr;
ddlQuestion.DataTextField = "Title ";
ddlQuestion.DataValueField = "QuestionKey ";
ddlQuestion.DataBind();
sdr.Close();
}
private int GetProductKey()
{
int ProductKey = 0;
try
{
ProductKey = Convert.ToInt32(Request.QueryString[ "ProductKey "]);
}
catch
{
ClientScript.RegisterStartupScript(ClientScript.GetType(), " ", " <script> alert( '非法操作! ');window.location= 'EditProduct.aspx ' </script> ");
}
finally
{
if (ProductKey == 0)
{
ClientScript.RegisterStartupScript(ClientScript.GetType(), " ", " <script> alert( '没有数据! ');window.location= 'EditProduct.aspx ' </script> ");
}
}
return ProductKey;
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
Product_QuestionBL productQuestionBL = new Product_QuestionBL();
TR_P_Product_Question productQuestion = new TR_P_Product_Question();
productQuestion.QuestionKey = Convert.ToInt32(ddlQuestion.SelectedValue);
productQuestion.ProductKey = Convert.ToInt32(ddlProduct.SelectedValue);
productQuestion.Sort = Convert.ToInt32(txtSort.Text);
bool result = productQuestionBL.InsertProductQusestion(productQuestion);
if (result)
{
ClientScript.RegisterStartupScript(ClientScript.GetType(), " ", " <script> alert( '添加成功! ') </script> ");
}
else
{
ClientScript.RegisterStartupScript(ClientScript.GetType(), " ", " <script> alert( '添加失败! ') </script> ");
}
txtSort.Text = "0 ";
BindddlProduct();
bindQuestion(Convert.ToInt32(ddlProduct.SelectedValue));
}
[解决办法]
what r u doing?
[解决办法]
查看源文件，看一下你的ddlProduct里是否包含FindByValue的值，估计是没有此值报的错
