Question

我在一个页面的图书馆管理系统中创建了一个网站这本书可用或不可用。如何检查，然后如何设置验证控制我的编码是

public partial class Issueofbook : System.Web.UI.Page
{
    public Int64 Sid;

    protected void Page_Load(object sender, EventArgs e)
    {
        string Id;
        Id = Request.QueryString.Get(0);

        if (!(IsPostBack == true))
        {
            if (Request.QueryString.Get(1) == "G")
            {
                Sid = Convert.ToInt64(Id);
                if (PopulatedRecord(Sid) == false)
                {

                }
            }
        }
    }
    private Boolean PopulatedRecord(Int64 Id)
    {
        DataSet DS;
        DS = new DataSet();
        SqlCommand cmd = new SqlCommand();
        SqlDataAdapter da = new SqlDataAdapter();
        SqlConnection Cnn = new SqlConnection();
        string connectionstring;
        connectionstring = @"Datasource=DEVI\SQLEXPRESS;Intial                                                
                    catalog=librarymanagement;Integrated Security=SSPI";
        Cnn.ConnectionString = connectionstring;
        if (Cnn.State != ConnectionState.Open)
            Cnn.Open();
        cmd.Connection = Cnn;
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.CommandText = "usbinsertdatainto";
        cmd.Parameters.Clear();
        cmd.Parameters.AddWithValue("@bookno", txtno);
        da.SelectCommand = cmd;
        try
        {
            da.Fill(DS);
        }
        catch (Exception ex)
        {
            throw new ApplicationException(
               "!!! An Error Occured While Update Record In Dtl_SecurityCapital_Upload." +
           ex.Message);
            lblerror.Visible = true;
            lblerror.Text = "!!! An Error Occured While " + ex.Message.ToString();
            return false;
        }
        if (DS.Tables[0].Rows.Count > 0)
        {
            txtno.Text = DS.Tables[0].Rows[0]["bookno"].ToString();
            txtstuno.Text = DS.Tables[0].Rows[0]["studentno"].ToString();
            RadioButton1.Text = DS.Tables[0].Rows[0]["copiesavaillable"].ToString();
            RadioButton2.Text = DS.Tables[0].Rows[0]["copiesavaillable"].ToString();
            txtdate.Text = DS.Tables[0].Rows[0]["IssueDate"].ToString();
            txtddate.Text = DS.Tables[0].Rows[0]["Duedate"].ToString();
        }
        cmd.Dispose();
        Cnn.Close();
        Cnn.Dispose();
        return true;
    }

    protected void Btn_click(object sender, EventArgs e)
{
    SqlCommand cmd = new SqlCommand();
    SqlConnection cnn = new SqlConnection();
    string connectionstring;
    connectionstring =  ConfigurationManager.ConnectionStrings["librarymanagementconnectionstring"].ConnectionStri  
       ng;
    cnn.ConnectionString = connectionstring;
    if (cnn.State != ConnectionState.Open)
        cnn.Open();
    cmd.Connection = cnn;
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.CommandText = "spupdatebookdetail";
    cmd.Parameters.Clear();
    cmd.Parameters.AddWithValue("@bookno", txtno.Text);
    cmd.Parameters.AddWithValue("@studentno", txtstuno.Text);
    cmd.Parameters.AddWithValue("@Issuedate", txtdate.Text);
    cmd.Parameters.AddWithValue("@Duedate", txtddate.Text);
    if(RadioButton1.Checked ==true)
    {
        cmd.Parameters.AddWithValue("@copiesavaillable", RadioButton1.Text);
    }
    if (RadioButton2.Checked==true)
    {
        cmd.Parameters.AddWithValue("@copiesavillable", RadioButton2.Text);
    }
    try
    {
        cmd.ExecuteNonQuery();
    }
    catch (Exception ex)
    {
        throw new ApplicationException("!!! An error an occured while update the record In Dtl _captial upload." + ex.Message);
        lblerror.Visible = true;
        lblerror.Text  = "!!! An error an occured while." + ex.Message.ToString();
    }
    lblerror.Visible  = true;
    lblerror.Text  = "Record update sucessfully";
    PopulatedRecord(Sid);
}

    protected void Button_click(object sender, EventArgs e)
    {
        Server.Transfer("useraccount.aspx");
    }

    protected void Button2_Click(object sender, EventArgs e)
    {

        SqlConnection cnn = new SqlConnection();
        string constr = null;
        SqlCommand cmd = new SqlCommand();
        constr = @"Data Source=DEVI\SQLEXPRESS; Initial Catalog =librarymanagement; Integrated Security=SSPI";
        cnn.ConnectionString = constr;
        try
        {
            if (cnn.State != ConnectionState.Open)
                cnn.Open();
        }
        catch (Exception ex)
        {
            string str1 = null;
            str1 = ex.ToString();
        }
        cmd.Connection = cnn;
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.CommandText = "uspInsertbookDatainto";
        cmd.Parameters.Clear();
        cmd.Parameters.AddWithValue("@bookno", txtno.Text);
        cmd.Parameters.AddWithValue("@studentno", txtstuno.Text);
        cmd.Parameters.AddWithValue("@Issuedate", txtdate.Text);
        cmd.Parameters.AddWithValue("@Duedate", txtddate.Text);
        if (RadioButton1.Checked == true)
        {
            cmd.Parameters.AddWithValue("@copiesavaillable", RadioButton1.Text);
        }
        if (RadioButton2.Checked == true)
        {
            cmd.Parameters.AddWithValue("@copiesavaillable", RadioButton2.Text);
        }
        try
        {
            cmd.ExecuteNonQuery();
        }
        catch (Exception ex)
        {
            throw new ApplicationException("!!! An error an occured while Insert Record Dtl_SecurityCapital_Upload." + ex.Message);
            lblerror.Visible = true;
            lblerror.Text = "!!! An Error occured while ." + ex.Message.ToString();
        }

        finally
        {
            cmd.Dispose();
        }
        cnn.Close();
        lblerror.Text = "New Issue of record suceessfully!!";
        txtno.Text = "";
        txtstuno.Text = "";
        txtdate.Text = "";
        txtddate.Text = "";
    }

}

Answer 1

在你的代码中有一些看起来很奇怪的东西。例如，(!(IsPostBack == true))应该是(!IsPostBack)。此外，您应该检查是否存在查询字符串参数，并按名称Request.QueryString["name"]获取它这样做

string id = Request.QueryString["id"];
if (id == null) 
{
    // do error handling here, no id specified;
}
else
{
    // use id;
}

......还有更多

你能否更具体地说明实际问题是什么，除了它没有运行？

asp.net如何使用check availlable controle使用？

1 个答案: