验证复选框。从静态方法检查

Question

I'm developing a web page for clients to request exemptions from certain requirements. There is a list of 14 CheckBoxes, each with two subsequent Checkboxes. The code to check which of them are checked will be placed in the submit button. This method is in the code behind. Here's the code for that (so far)

[WebMethod]
public void SendForm(string email)
{
    if (string.IsNullOrEmpty(email))
    {
        throw new Exception("You must supply an email address.");
    }
    else
    {
        if (IsValidEmailAddress(email))
        {
            bool[] desc = new bool[14];
            bool[] local = new bool[14];
            bool[] other = new bool[14];

            for (int i = 1; i <= 14; i++)
            {
                desc[i] = ((CheckBox)Page.FindControl("chkDesc" + i.ToString())).Checked;
                local[i] = ((CheckBox)Page.FindControl("chkLocal" + i.ToString())).Checked;
                other[i] = ((CheckBox)Page.FindControl("chkOther" + i.ToString())).Checked;

                /* Do stuff here */
            }
        }
        else
        {
            throw new Exception("You must supply a valid email address.");
        }
    }
}

I get the error "An object reference iw required for the non-static field, method, or property..."

In the aspx page I have the button and the javascript/ajax that calls the button in the codebehind. Shown here:

<table width='750' align='center'>
    <tr>
        <td align='left'>
            <label>Please Provide your email address:</label>
            <asp:TextBox ID="txtEmail" runat="server"></asp:TextBox>
        </td>
    </tr>
    <tr>
        <td align='left'>
            &nbsp;
        </td>
    </tr>
    <tr>
        <td align='left'>
            <fieldset id="Fieldset">
                <button onclick="SendForm();">
                    Send</button>               
                &nbsp;
                <button onclick="CancelForm();">
                    Cancel</button>                  
            </fieldset>
        </td>
    </tr>
</table>
</form>

<asp:ScriptManager ID="ScriptManager1" EnablePageMethods="true" EnablePartialRendering="true" runat="server" />

<script type="text/javascript">
    function SendForm() {
        var email = $get("txtEmail").value;

        PageMethods.SendForm(email, OnSucceeded, OnFailed);
    }

    function OnSucceeded() {
        $get("Fieldset").innerHTML = "<p>Thank you!</p>";
    }

    function OnFailed(error) {
        alert(error.get_message());
    }
</script>

Answer 1

据我所知，除非并且除非您将“ Page”对象的引用显式传递给您编写的Web方法，否则您不能在静态方法中引用页面的控件。

Answer 2

Where you have the following code:

bool[] desc = new bool[14];
bool[] local = new bool[14];
bool[] other = new bool[14];

for (int i = 1; i <= 14; i++)
{
    desc[i] = ((CheckBox)Page.FindControl("chkDesc" + i.ToString())).Checked;
    local[i] = ((CheckBox)Page.FindControl("chkLocal" + i.ToString())).Checked;
    other[i] = ((CheckBox)Page.FindControl("chkOther" + i.ToString())).Checked;

    /* Do stuff here */
}

Why don't you have this validation code in a Class in your project.. is there a reason why you are trying to access the PageControls using this code

if (IsValidEmailAddress(email))         
{             
   for (int i = 1; i <= count; i++)
   { 
     CheckBox chkBox = chkDesc1.Checked;
   }
} 

Change your for loop and start i = 0 and change <= 14 to < 13 C# is 0 based Place the whole method signature .. you are probably trying to call a non static method inside of your application either add the word static to the method or remove but I would rather see how you have the method created.. also where are you creating the instance of the WebMethod Class object..?