将文本框的内容添加到列表框 [英] adding contents of textboxes into listbox

问题描述

单击添加按钮时，我有四个texbox，应将文本框中的数据添加到列表框中，下一次当我添加数据时，必须对一个文本框进行验证，无论列表框中是否存在相同的数据( 与此无关的数据库")??


在此先感谢您，

I have four texboxes on click of add button the data in the textboxes should be added into a listbox,next time when i add the data, validation has to be done with respect to one textbox whether same data is present in listbox("No database involved in this")??


thanks in advance,

推荐答案

您可以使用listbox.Items.Add(http://msdn.microsoft.com/en-us/library/system.windows.controls.itemcollection.add.aspx [ ^ ])添加列表中有一个新项目.

要测试是否存在，您可以使用例如简单的LINQ查询来检查集合中是否已存在文本，例如(根据您的需要进行修改):

You can use listbox.Items.Add ( http://msdn.microsoft.com/en-us/library/system.windows.controls.itemcollection.add.aspx[^] ) to add a new item to the list.

To test the existence you can use for example a simple LINQ query to check if the text already exists in the colection, something like (modify according to your needs):

var AmIThere = from item in listbox.Items
               where item.ToString() == "SomeText" //most likely some variable here
               select item;

if (AmIThere.Count() = 0) {
...

在添加按钮单击事件上添加此代码.
假设您的文本框的名称为textBox1，列表框的名称为listBox1.

add this code on the add button click event.
assuming your textbox''s name is textBox1 and the listbox''s name is listBox1.

string[] contents = new string[4]
{
    textBox1.Text,
    textBox2.Text,
    textBox3.Text,
    textBox4.Text
};


foreach (string content in contents)
{

    bool isValid = true;
    foreach (string item in listBox1.Items)
    {
        if (item == content)
        {
            MessageBox.Show("Already in the list.");
            isValid = false;
        }
    }

    if (isValid)
        listBox1.Items.Add(content);
}

这篇关于将文本框的内容添加到列表框的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！