Question

我有一项任务是在三个bool为真后使Button处于活动状态

public bool isFileOpened = false;
public bool isDrive = false;
public bool  isPrice = false;

填充两个文本框后，它们变得正确 filePath字符串不为空

private void textBox1_TextChanged(object sender, EventArgs e) {
    drive = CheckIntInput(sender, "not valid");
    if (drive != 0) {
        isDrive = true;
    }
}
private void textBox2_TextChanged(object sender, EventArgs e) {
    price = CheckIntInput(sender, "not valid");
    if (price != 0) {
        isPrice = true;
    }
}
private void openFileDialog1_FileOk(object sender, System.ComponentModel.CancelEventArgs e) {
    filePath = openFileDialog1.FileName;
    label1.Text = filePath;
    isFileOpened = true;  
}

CheckIntInput方法从文本框返回数字，如果不能将字符串转换为数字

，则返回0

我怎么能意识到这样的事情：

if (isFileOpened && isDrive && isPrice) {
    showButton.Enabled = true;
}

我希望在所有三个bool变为true后立即启用按钮，并且可以以不同方式输入theese三个字段，例如

TextBox1中
TextBox2中
openfiledialog1

或

TextBox1中
openfiledialog1
TextBox2中

Answer 1

有多种方法可以做到这一点，我会使用带有支持字段的属性，如下所示：

public bool IsFileOpened
{
    get { return _isFileOpened; }
    set
    {
        _isFileOpened = value;
        UpdateShowButton();
    }
}

public bool IsDrive
{
    get { return _isDrive; }
    set
    {
        _isDrive = value;
        UpdateShowButton();
    }
}

public bool IsPrice
{
    get { return _isPrice; }
    set
    {
        _isPrice = value;
        UpdateShowButton();
    }
}

private void UpdateShowButton()
{
    if (IsPrice && IsDrive && IsFileOpened)
        showButton.Enabled = true;
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
    drive = CheckIntInput(sender, "not valid");
    if (drive != 0)
    {
        IsDrive = true;
    }
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
    price = CheckIntInput(sender, "not valid");
    if (price != 0)
    {
        IsPrice = true;
    }
}
private void openFileDialog1_FileOk(object sender, System.ComponentModel.CancelEventArgs e)
{
    filePath = openFileDialog1.FileName;
    label1.Text = filePath;
    IsFileOpened = true;
}

实际上我也重命名了它，所以你必须使用带有大写起始字母的属性。现在，每次更新属性时，都会检查是否启用了showButton。

Here您可以阅读有关字段和属性的更多信息（还有支持字段）。

bools为true后启用按钮

1 个答案: