C# - 帶有子控件和數據綁定的 Windows 窗體用戶控件

Question

我創建了一個相當簡單的用戶控件，其中包含一些子控件和組件。 我在一個組件屬性和一個控件屬性之間添加了一個單一的數據綁定。 到目前為止一切順利，當我將用戶控件添加到表單時出現問題。 Visual Studio 序列化程序以InitializeComponent方法的形式再次添加該綁定，因此拋出異常告訴我該屬性已綁定數據。

另一個小問題是它還會序列化我在用戶控件本身中更改的屬性，即使我沒有在表單中更改它們。 那個問題可能會導致上面的問題，我真的不知道。

用戶控制代碼：

public partial class BrowseFolder : UserControl {
    private const string CATEGORY_CONTROLS = "Controls";

    public BrowseFolder() {
        InitializeComponent();
    }

    [Category(CATEGORY_CONTROLS)]
    [Description("The label that describes the folder's meaning in the context it's in.")]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    public Label Label => this.Lbl;
    [Category(CATEGORY_CONTROLS)]
    [Description("The text box that displays or lets the user edit the full path of the folder.")]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    public TextBox TextBox_DirectoryFullPath => this.TxtBox_DirectoryFullPath;
    [Category(CATEGORY_CONTROLS)]
    [Description("The button that displays the folder browse dialog when clicked.")]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    public Button Button_BrowseDirectory => this.Btn_BrowseDirectory;
    [Category(CATEGORY_CONTROLS)]
    [Description("The folder browse dialog.")]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    public NotifyPropertyChangedFolderBrowseDialog FolderBrowserDialog => this.Fbd;

    private void Btn_BrowseDirectory_Click(object sender, EventArgs e) =>
        this.FolderBrowserDialog.ShowDialog(this);

    private void InitializeComponent() {
        // initialize...

        // 
        // Btn_BrowseDirectory
        // 
        this.Btn_BrowseDirectory.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
        this.Btn_BrowseDirectory.Location = new System.Drawing.Point(365, 0);
        this.Btn_BrowseDirectory.Margin = new System.Windows.Forms.Padding(3, 0, 0, 0);
        this.Btn_BrowseDirectory.Name = "Btn_BrowseDirectory";
        this.Btn_BrowseDirectory.Size = new System.Drawing.Size(75, 23);
        this.Btn_BrowseDirectory.TabIndex = 9;
        this.Btn_BrowseDirectory.Text = "Browse...";
        this.Btn_BrowseDirectory.UseVisualStyleBackColor = true;
        this.Btn_BrowseDirectory.Click += new System.EventHandler(this.Btn_BrowseDirectory_Click);
        // 
        // Lbl
        // 
        this.Lbl.AutoSize = true;
        this.Lbl.Location = new System.Drawing.Point(-3, 5);
        this.Lbl.Margin = new System.Windows.Forms.Padding(0);
        this.Lbl.Name = "Lbl";
        this.Lbl.Size = new System.Drawing.Size(31, 13);
        this.Lbl.TabIndex = 8;
        this.Lbl.Text = "Text:";
        // 
        // TxtBox_DirectoryFullPath
        // 
        this.TxtBox_DirectoryFullPath.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
        | System.Windows.Forms.AnchorStyles.Right)));
        this.TxtBox_DirectoryFullPath.DataBindings.Add(new System.Windows.Forms.Binding("Text", this.Fbd, "SelectedPath", true));
        this.TxtBox_DirectoryFullPath.Location = new System.Drawing.Point(31, 2);
        this.TxtBox_DirectoryFullPath.Margin = new System.Windows.Forms.Padding(3, 0, 3, 0);
        this.TxtBox_DirectoryFullPath.Name = "TxtBox_DirectoryFullPath";
        this.TxtBox_DirectoryFullPath.Size = new System.Drawing.Size(328, 20);
        this.TxtBox_DirectoryFullPath.TabIndex = 7;

        // initialize...
    }
    // controls fields declerations...
}

表格代碼：

class MyForm : Form {
    // other stuff...

    private void InitializeComponent() {
        // initialize...

        // browseFolder1
        // 
        // 
        // browseFolder1.Btn_BrowseDirectory
        // 
        this.browseFolder1.Button_BrowseDirectory.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
        this.browseFolder1.Button_BrowseDirectory.Location = new System.Drawing.Point(365, 0);
        this.browseFolder1.Button_BrowseDirectory.Margin = new System.Windows.Forms.Padding(3, 0, 0, 0);
        this.browseFolder1.Button_BrowseDirectory.Name = "Btn_BrowseDirectory";
        this.browseFolder1.Button_BrowseDirectory.Size = new System.Drawing.Size(75, 23);
        this.browseFolder1.Button_BrowseDirectory.TabIndex = 9;
        this.browseFolder1.Button_BrowseDirectory.Text = "Browse...";
        this.browseFolder1.Button_BrowseDirectory.UseVisualStyleBackColor = true;
        // 
        // browseFolder1.Lbl
        // 
        this.browseFolder1.Label.AutoSize = true;
        this.browseFolder1.Label.Location = new System.Drawing.Point(-3, 5);
        this.browseFolder1.Label.Margin = new System.Windows.Forms.Padding(0);
        this.browseFolder1.Label.Name = "Lbl";
        this.browseFolder1.Label.Size = new System.Drawing.Size(31, 13);
        this.browseFolder1.Label.TabIndex = 8;
        this.browseFolder1.Label.Text = "Text:";
        this.browseFolder1.Location = new System.Drawing.Point(53, 86);
        this.browseFolder1.Margin = new System.Windows.Forms.Padding(3, 1, 3, 1);
        this.browseFolder1.Name = "browseFolder1";
        this.browseFolder1.Size = new System.Drawing.Size(440, 22);
        this.browseFolder1.TabIndex = 8;
        // 
        // browseFolder1.TxtBox_DirectoryFullPath
        // 
        this.browseFolder1.TextBox_DirectoryFullPath.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
        | System.Windows.Forms.AnchorStyles.Right)));
        this.browseFolder1.TextBox_DirectoryFullPath.DataBindings.Add(new System.Windows.Forms.Binding("Text", this.browseFolder1.FolderBrowserDialog, "SelectedPath", true));
        this.browseFolder1.TextBox_DirectoryFullPath.Location = new System.Drawing.Point(31, 2);
        this.browseFolder1.TextBox_DirectoryFullPath.Margin = new System.Windows.Forms.Padding(3, 0, 3, 0);
        this.browseFolder1.TextBox_DirectoryFullPath.Name = "TxtBox_DirectoryFullPath";
        this.browseFolder1.TextBox_DirectoryFullPath.Size = new System.Drawing.Size(328, 20);
        this.browseFolder1.TextBox_DirectoryFullPath.TabIndex = 7;

        // initialize...
    }
    // controls fields declerations...
} 

拋出的異常：

Answer 1

您已使用以下內容裝飾您的TextBox屬性：

[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
public TextBox SomeTextBox { get { return someTextBox; } }

這意味着SomeTextBox具有與默認值不同的值的所有屬性都將被序列化。

為了解決有關DataBinding的問題，防止它在表單中被序列化，如果控件不在設計模式，請在您的用戶控件中添加數據綁定：

if(LicenseManager.UsageMode != LicenseUsageMode.Designtime)
    someTextBox.DataBindings.Add("Text", SomeOtherControl, "SomeProperty", true);