RadioButtonList SelectedItem返回NULL
RadioButtonList SelectedItem返回NULL
提问于 2019-10-02 04:12:20
我有这个RadioButton，但它不返回值，总是为null或为空。
无线电就是这个：
<asp:RadioButtonList ID="rblParcelamento" runat="server"/>我用下面的代码填充RadioButtonList：
if (!IsPostBack)
{
if (decimal.Parse(txtValorTotal.InnerHtml) < 500)
{
string val = string.Format("{0:#.00}", Convert.ToDouble(txtValorTotal.InnerHtml) * 0.987);
rblParcelamento.Items.Add(new ListItem("1 x " + string.Format("{0:#.00}", val) + " - Prazo: 7 dias", "1"));
}
else
{
string val = string.Format("{0:#.00}", Convert.ToDouble(txtValorTotal.InnerHtml) * 0.987);
rblParcelamento.Items.Add(new ListItem("1 x " + string.Format("{0:#.00}", val) + " - Prazo: 28 dias", "1"));
}
if (decimal.Parse(txtValorTotal.InnerHtml) >= 1000)
{
string val = string.Format("{0:#.00}", decimal.Parse(txtValorTotal.InnerHtml) / 2);
rblParcelamento.Items.Add(new ListItem("2 x " + val + " - Prazo: 21/35 ddl", "2"));
}
if (decimal.Parse(txtValorTotal.InnerHtml) >= 1500)
{
string val = string.Format("{0:#.00}", decimal.Parse(txtValorTotal.InnerHtml) / 3);
rblParcelamento.Items.Add(new ListItem("3 x " + val + " - Prazo: 21/28/35 ddl", "3"));
}
if (decimal.Parse(txtValorTotal.InnerHtml) >= 2000)
{
string val = string.Format("{0:#.00}", decimal.Parse(txtValorTotal.InnerHtml) / 4);
rblParcelamento.Items.Add(new ListItem("4 x " + val + " - Prazo: 21/28/35/42 ddl", "4"));
}
}当我尝试像这样捕获时，rblParcelamento.SelectedItem.Value返回null，rblParcelamento.SelectedValue也是空的。
回答 1
Stack Overflow用户
发布于 2019-10-02 20:22:27
我认为问题是因为你没有在你的RadioButtonList上选择任何东西。
您需要先使用SelectedIndex.SelectedValue，SelectedItem来选择它，或者在用户选择它之后获取值。
假设您想要在设置rblParcelamento.SelectedItem.Value的值之后使用它，请尝试以下操作：
if (!IsPostBack)
{
decimal total = decimal.Parse(txtValorTotal.InnerHtml);
if (total < 500)
{
string val = string.Format("{0:#.00}", Convert.ToDouble(total) * 0.987);
rblParcelamento.Items.Add(new ListItem("1 x " + string.Format("{0:#.00}", val) + " - Prazo: 7 dias", "1"));
}
else
{
string val = string.Format("{0:#.00}", Convert.ToDouble(total) * 0.987);
rblParcelamento.Items.Add(new ListItem("1 x " + string.Format("{0:#.00}", val) + " - Prazo: 28 dias", "1"));
}
if (total >= 1000)
{
string val = string.Format("{0:#.00}", total / 2);
rblParcelamento.Items.Add(new ListItem("2 x " + val + " - Prazo: 21/35 ddl", "2"));
}
if (total >= 1500)
{
string val = string.Format("{0:#.00}", total / 3);
rblParcelamento.Items.Add(new ListItem("3 x " + val + " - Prazo: 21/28/35 ddl", "3"));
}
if (total >= 2000)
{
string val = string.Format("{0:#.00}", total / 4);
rblParcelamento.Items.Add(new ListItem("4 x " + val + " - Prazo: 21/28/35/42 ddl", "4"));
}
rblParcelamento.SelectedIndex = 0; //you first need to select your item, in this case, the first one
//rblParcelamento.SelectedValue = "1"; //this also works
//rblParcelamento.SelectedItem => this could work if you save a variable with (new ListItem)
}
string rblValue = rblParcelamento.SelectedItem.Value; //then you can get the value of the selected item页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/58191652
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