C# 匹配的最佳重载方法...有一些无效参数

Question

public class RegistrationClass
{
    SqlConnection myConnection = new SqlConnection("Data Source=MOE-PC\\SQLEXPRESS;Initial Catalog=db_University;Integrated Security=True;Pooling=False");
    ConnectionClass con = new ConnectionClass();
    int ID , i;
    String fullName, motherName, gender, placeOfBirth, email, phone, adress, schoolDegree, languages, highSchool, faculty, major;

    public void setValues (String fullName1,String motherName1,String gender1,String placeOfBirth1,String email1,String phone1,String adress1, String faculty1,String major1,String schoolDegree1,String languages1,String highSchool1)
    {
        fullName = fullName1;
        motherName = motherName1;
        gender = gender1;
        placeOfBirth= placeOfBirth1;
        email =email1;
        phone= phone1;
        adress =adress1;
        faculty =faculty1;
        major =major1;
        schoolDegree =schoolDegree1;
        languages =languages1;
        highSchool = highSchool1;
    }

这是点击注册按钮时的网络表单

public partial class WebForm1 : System.Web.UI.Page
{
    protected void Button_Register_Click(object sender, EventArgs e)
    {
        string lang = "";
        Classes.RegistrationClass R = new Classes.RegistrationClass();
        R.setValues(txt_Name.ToString, txt_MotherName.ToString, dropDown_Gender.ToString, dropDown_POB.ToString, txt_Email.ToString, txt_Phone.ToString, txt_Adress.ToString, DropDown_Faculty.ToString, DropDown_Major.ToString, dropDown_SchoolDegree.ToString, txt_Name.ToString, txt_HighSchool.ToString);

这是错误：

'CCharpApp.RegistrationClass.setValues(string,string,string,string,string,string,string,string,string,string,string,string)' 的最佳重载方法匹配有一些无效参数。

Answer 1

当dynamic 变量作为参数传递给方法时，也会发生这种情况。编译器编译没有错误，可能有执行错误。

Answer 2

txt_Name.ToString 解析为引用ToString 方法的方法组。它不调用ToString。为此，您需要写txt_Name.ToString()。话虽如此，您也不想这样做。 TextBox 的 ToString 方法不返回控件的文本。 Text 属性是你获取文本的方式，所以你想写：txt_Name.Text。

最后，你应该避免使用参数太多的函数。当您遇到有很多争论时看到的错误时，尝试确定哪里出了问题会变得更加困难；有很多方法可以关闭它。相反，RegistrationClass 应该简单地具有每个这些值的属性，然后调用者可以单独设置每个属性。这将更容易使用。