How to fill in TextBoxes?

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How to fill in TextBoxes?

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#1 by (1 votes)

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I would not like to use multiple if's to control a method of mine, unless there is no way to do it without if's . Record in a list, the return of the DB that may or may not have bank information. The list returns me, Nome_Banco , Conta and Agencia . I need to fill in textbox , but only if there is data. I'm having trouble doing it without using if's . See how it is currently.

if (vlstCorpFornecedor.Count > 0)
        {
            //string nm_banco = vlstCorpFornecedor[0].Banco.ToString();
            txtCpfCnpjCadFornecedor.Text = vlstCorpFornecedor[0].NuCPFCNPJ.ToString();
            txtNomeRazaoSocialCadFornecedor.Text = vlstCorpFornecedor[0].Nome.ToString();
            txtAgenciaCadFornecedor.Text = vlstCorpFornecedor[0].Agencia.ToString();
            txtContaCadFornecedor.Text = vlstCorpFornecedor[0].ContaCorrente.ToString();
            cmbBancos.SelectedValue = vlstCorpFornecedor[0].Banco.ToString();
            cmbBancos_SelectedIndexChanged(this, EventArgs.Empty);
        }

Where vlstCorpFornecedor is my list. From here txtAgenciaCadFornecedor and I can only fill in whether or not data exists. I can do with if's and test whether it is null or not, but the question is: Is there a way to do this without if ?

Responding to Maniero.

These fields are displayed in a panel, type a "popup". These fields are in this panel. When in the form I type the CPF or CNPJ, there the panel is visible and these fields are filled after the search in the database. The list below: CPF / CNPJ, Corporate Name, Agency, Account, Bank Number and Name of Bank (Institution).

Well, it happens, since this is an old registry, I do not always have the banking information. So when the panel is displayed (Visible), if any bank data come null , it will give error when assigning value to TextBoxes relative.

I would like to avoid this error by already testing null in the information. if it is null, the panel is displayed (Visible) with CPF / CNPJ and Social Ratio completed and the other textboxes must be blank (empty) to be filled manually (user types the fields, agency, account, number and name of the bank (institution)).

c# asp.net .net

asked by anonymous 30.12.2014 / 16:15

1 answer

Get value expression How to know how many pixels has a div with height: 100%? And how can I subtract a certain value from this total of pixels and apply what's left of the other div

score 1 · Accepted Answer

If I understand correctly you can avoid if itself but you can not avoid a decision, so I'll use a ternary operator (I'll just put what matters, then you reply to the other fields):

txtAgenciaCadFornecedor.Text = vlstCorpFornecedor[0].Agencia == null ? 
                                   "" : 
                                   vlstCorpFornecedor[0].Agencia.ToString();

So if the data is null it takes an empty string , otherwise it gets the data.

Are you sure you need ToString() ? If you do not need it, you can simplify this by using the null-coalescing operator. You do not seem to need it.

txtAgenciaCadFornecedor.Text = vlstCorpFornecedor[0].Agencia ?? "";

An alternative would be to create an auxiliary method. Thinking fast could be a generic extension method that would turn anything string into something (give it to do even better), something like this:

public static string Coalesce<T>(this T obj, string defaultValue = "") {
    if (obj == null)
        return defaultValue;
    return obj.ToString();
}

Usage:

txtAgenciaCadFornecedor.Text = vlstCorpFornecedor[0].Agencia.Coalesce();