Question

我有一个表单，我想重复用于添加新记录和编辑现有记录。当我从GridView中选择记录时，我能够成功加载包含相关数据的页面，并且我能够正确地更新db记录。但是，我的问题是尝试将表单用于两个执行。这是我的代码背后的逻辑:(当我点击GridView中的行时，我分配了一个会话变量，这确实有效）

protected void Page_Load(object sender, EventArgs e)
{
    resultOutput.Visible = false;//Output results as to whether or not a record was added successfully is automatically hidden at page load

    //Checking to see if session variable has been created
    if (Session["editID"] != null)
    {               
        //Create objects to get recipe data
        dbCRUD db = new dbCRUD();
        Recipe editRecipe = new Recipe();

        //Grabbing session ID and assigning to a variable in order to remove the session variable
        var id = Convert.ToInt32(Session["editID"]);
        Session.Remove("editID");

        //Call method to retrieve db data
        editRecipe = db.SelectRecord(id);

        //Populate results to text boxes
        recordID.Text = id.ToString();
        addName.Text = editRecipe.Name;
        addTypeDDL.SelectedValue = editRecipe.Meal;
        addDifficultyDDL.SelectedValue = editRecipe.Difficulty;
        addCookTime.Text = editRecipe.Cook_Time.ToString();
        addDirections.Text = editRecipe.Directions;

        //Change Button Text
        submitRecord.Visible = false;
        changeRecord.Visible = true;

        //Change Title Text
        addEditTitle.Text = "Edit Recipe";

    }
}

protected void submitRecord_Click(object sender, EventArgs e) 
{
    //Variables for execution results
    var modified = "";
    int returned = 0;

    //Creating the recipe Object to pull the values from the form and 
    //send the recipe object as a parameter to the method containing insert stored procedure
    //depending on Add or Edit
    Recipe recipe = new Recipe();
    recipe.Name = addName.Text;
    recipe.Meal = addTypeDDL.Text;
    recipe.Difficulty = addDifficultyDDL.Text;
    recipe.Cook_Time = int.Parse(addCookTime.Text);
    recipe.Directions = addDirections.Text;

    //Creating object to access insert method
    dbCRUD newRecord = new dbCRUD();

    //Checking to see if the page is loaded for edit or new addition
    if (Session["editID"] != null)
    {
        //If recordID exists, recipe will be passed as to UpdateRecord method
        recipe.Recipe_ID = int.Parse(recordID.Text);
        returned = newRecord.UpdateRecord(recipe);
        modified = "has been edited.";
        Session.Remove("editID");
    }
    else
    {
        //If recordID does not exist, record will be passed to InsertRecord method (new recipe)
        returned = newRecord.InsertRecord(recipe);
        modified = "added";
    }

    //Method returns 0 if successful, 1 if sql error, 2 if other error
    if (returned == 1)
    {
        resultOutput.Text = "There was an sql exception";
        resultOutput.Visible = true;
    }
    else if (returned == 2)
    {
        resultOutput.Text = "There was a non sql exception";
        resultOutput.Visible = true;
    }
    else
    {
        resultOutput.Text = "\"" + addName.Text + "\" recipe " + modified;
        resultOutput.Visible = true;
    }

}

我在if（Session [“editID”]！= null）行上有问题 - 我总是转移到else逻辑，if逻辑永远不会运行。

这是我在GridView中的click方法：

protected void Grid_Recipe_SelectedIndexChanged(object sender, EventArgs e)
{
    int index = Convert.ToInt32(Grid_Recipe.SelectedDataKey.Value);
    Session["editID"] = index;
    Response.Redirect("addRecord.aspx");
}

我的问题是如何在submitRecord_Click事件期间控制执行，以便我调用适当的方法。谢谢！

Answer 1

您是否考虑过使用

if(Page.IsPostBack)
{
   code here
}

要检测您是否要回发到该页面？然后你可以检查你的物品价值。我认为没有理由代码不应该在Session变量中 - 你是否尝试在那里放一个断点来查看代码是否真的进入那里？

你的addRecord.aspx也只是添加记录吗？如果是这样，只需在此类中添加记录，但使用PostBack检查查看。您能否确保在正确的背景下保存：

// Outside of Web Forms page class, use HttpContext.Current.
HttpContext context = HttpContext.Current;
context.Session["editID"] = index;
...
int Id = (string)(context.Session["editID"]);

Answer 2

我能够找出我的问题 - 实际上变成了两个问题。首先，我必须将我的页面加载逻辑放在if（！IsPostBack）语句中，因为我无法编辑页面。原因是我正在将最初发布的数据加载到页面加载的表单上，该表单在我的逻辑之前执行。添加if（！IsPostBack）控制语句修复了此问题。从那里开始，我仍然使用会话变量来控制逻辑背后的代码，只是我确保只在表单和gridview之间保留我的会话变量。基本上，当gridview加载并且它不是回发时，会话变量被清除。这让我在单击一行时设置一个新的会话变量，然后一旦我返回网格查看结果就清除会话变量。谢谢你的帮助！

C＃代码隐藏控件表单执行

2 个答案: