3层架构编译错误



我在C#WinForms应用程序中使用的是三层体系结构。当我编译应用程序时,在我的Presentation layer form1.cs 中出现以下错误

代码:

private void btnSave_Click(object sender, EventArgs e)
{
    BLL.clsBLL obj = new BLL.clsBLL();
    string firstname = txtClientFirstName.Text;
    string lastname = txtClientLastName.Text;
    string age = txtClientAge.Text;
    int Res = 0;
    try
    {
        Res = obj.Save_Client(Client_FirstName, Client_Lastname, Client_Age);
    }
        catch(SqlException ex)
    {
MessageBox.Show(ex.Message);
    }
    if(Res ==1)
    {
MessageBox.Show("Data Saved");
    }
    else
    {
        MessageBox.Show("Data Not Saved");
    }
}

错误:

"BLL.clsLL"不包含"Save_Client"的定义,并且没有扩展方法"Save_Client"接受类型为的第一个参数找不到"BLL.clsLL"(是否缺少using指令或装配参考?)

BLL层中Save_Client的代码如下:

代码:

public int Save_Client(string Client_FirstName, string Client_Lastname, string Client_Age)
{
    Boolean bopassed = true;
    bopassed = Check_Rules(Client_FirstName, Client_Lastname, Client_Age);
    DAL.clsDAL obj = new DAL.clsDAL();
    int Res = 0;
    try
    {
        if (bopassed == true)
        {
obj.Insert_Clients(Client_FirstName, Client_Lastname, Convert.ToInt32(Client_Age));
Res = 1;
        }
        else
        {
Res = 0;
        }
    }
    catch (SqlException)
    {
        throw;
    }
    return Res;
}
private Boolean  Check_Rules(Client_FirstName, Client_Lastname, Client_Age)
{
    Boolean bolres = true;
    if(Client_FirstName=="")
    {
        bolres=false;
    }
    if(Client_Lastname=="")
    {
        bolres=false;
    }
    if(Client_Age=="")
    {
        bolres=false;
    }
    return bolres;
}

错误:

"需要标识符"

在方法私有布尔校验规则(Client_FirstName,Client_Lastname,Client_Age)

我搞不清出错的原因。

有人能告诉我问题出在哪里吗?

您忘记在Check_Rules方法中说明参数的类型。您需要更改此行:

private Boolean Check_Rules(Client_FirstName, Client_Lastname, Client_Age)

到此:

private Boolean Check_Rules(string Client_FirstName, string Client_Lastname, string Client_Age)

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