扩展的DataGridView不应用更改

Question

我扩展了一个DataGridView，但不幸的是，在使用了工具箱中的模板之后，它为我生成了默认参数。看起来它覆盖了我的设置。我在这里做错了什么？

class CustomDataGrid2 : DataGridView
{
    public CustomDataGrid2() : base()
    {
        base.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.DisableResizing;
        base.ColumnHeadersHeight = 23;
        System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle1 = new System.Windows.Forms.DataGridViewCellStyle();
        base.BackgroundColor = System.Drawing.Color.FromArgb(((int)(((byte)(224)))), ((int)(((byte)(224)))), ((int)(((byte)(224)))));
        base.ColumnHeadersBorderStyle = System.Windows.Forms.DataGridViewHeaderBorderStyle.None;
        dataGridViewCellStyle1.Alignment = DataGridViewContentAlignment.MiddleLeft;
        dataGridViewCellStyle1.BackColor = System.Drawing.SystemColors.ControlDark;
        dataGridViewCellStyle1.Font = new System.Drawing.Font("Verdana", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
        dataGridViewCellStyle1.ForeColor = System.Drawing.Color.White;
        dataGridViewCellStyle1.SelectionBackColor = System.Drawing.SystemColors.Highlight;
        dataGridViewCellStyle1.SelectionForeColor = System.Drawing.SystemColors.HighlightText;
        dataGridViewCellStyle1.WrapMode = System.Windows.Forms.DataGridViewTriState.True;
        base.ColumnHeadersDefaultCellStyle = dataGridViewCellStyle1;

        base.EnableHeadersVisualStyles = false;
        base.Location = new System.Drawing.Point(112, 186);
        base.RowHeadersVisible = false;
        base.Size = new System.Drawing.Size(401, 150);
    }
}

结果：

// 
// customDataGrid21
// 
this.customDataGrid21.BackgroundColor = System.Drawing.Color.FromArgb(((int)(((byte)(224)))), ((int)(((byte)(224)))), ((int)(((byte)(224)))));
this.customDataGrid21.ColumnHeadersBorderStyle = System.Windows.Forms.DataGridViewHeaderBorderStyle.None;
dataGridViewCellStyle1.Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleLeft;
dataGridViewCellStyle1.BackColor = System.Drawing.SystemColors.ControlDark;
dataGridViewCellStyle1.Font = new System.Drawing.Font("Verdana", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
dataGridViewCellStyle1.ForeColor = System.Drawing.Color.White;
dataGridViewCellStyle1.SelectionBackColor = System.Drawing.SystemColors.Highlight;
dataGridViewCellStyle1.SelectionForeColor = System.Drawing.SystemColors.HighlightText;
dataGridViewCellStyle1.WrapMode = System.Windows.Forms.DataGridViewTriState.True;
this.customDataGrid21.ColumnHeadersDefaultCellStyle = dataGridViewCellStyle1;
this.customDataGrid21.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
this.customDataGrid21.EnableHeadersVisualStyles = false;
this.customDataGrid21.Location = new System.Drawing.Point(60, 138);
this.customDataGrid21.Name = "customDataGrid1";
this.customDataGrid21.RowHeadersVisible = false;
this.customDataGrid21.Size = new System.Drawing.Size(401, 150);
this.customDataGrid21.TabIndex = 3;

如您所见，我设置了DataGridViewColumnHeadersHeightSizeMode.DisableResizing，但它生成了AutoSize

我也试过：

class CustomDataGrid4 : DataGridView
{
    public CustomDataGrid4() : base()
    {
    }

    protected override void OnLayout(LayoutEventArgs e)
    {
        base.OnLayout(e);

        base.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.DisableResizing;
        base.ColumnHeadersHeight = 23;

    }
}

结果：

// 
// customDataGrid41
// 
this.customDataGrid41.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
this.customDataGrid41.Location = new System.Drawing.Point(96, 152);
this.customDataGrid41.Name = "customDataGrid41";
this.customDataGrid41.Size = new System.Drawing.Size(240, 150);
this.customDataGrid41.TabIndex = 3;

解决方案：

class CustomDataGrid6 : DataGridView
{
    private DataGridViewColumnHeadersHeightSizeMode m_ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.DisableResizing;
    private int m_columnHeadersHeight = 23;

    public new DataGridViewColumnHeadersHeightSizeMode ColumnHeadersHeightSizeMode
    {
        get => this.m_ColumnHeadersHeightSizeMode;
        set
        {
            this.m_ColumnHeadersHeightSizeMode = value;
            base.ColumnHeadersHeightSizeMode = this.m_ColumnHeadersHeightSizeMode;
        }
    }

    public int ColumnHeadersHeight
    {
        get => this.m_columnHeadersHeight;
        set
        {
            this.m_columnHeadersHeight = value;
            base.ColumnHeadersHeight = this.m_columnHeadersHeight;
        }
    }
}

Answer 1

在重写的OnLayout()方法中设置属性：

MSDN：派生类应该重写此方法来执行任何自定义布局逻辑。

private DataGridViewColumnHeadersHeightSizeMode m_ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.DisableResizing;

public CustomDGV() { }

protected override void OnLayout(LayoutEventArgs e)
{
    base.OnLayout(e);
    base.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.DisableResizing; 
}

public new DataGridViewColumnHeadersHeightSizeMode ColumnHeadersHeightSizeMode
{
    get => this.m_ColumnHeadersHeightSizeMode;
    set {  this.m_ColumnHeadersHeightSizeMode = value;
           base.ColumnHeadersHeightSizeMode = this.m_ColumnHeadersHeightSizeMode;
    }
}

当您将自定义控件放在窗体上时，DataGridViewColumnHeadersHeightSizeMode.DisableResizing将是ColumnHeadersHeightSizeMode的应用值

使用Label.AutoSize属性尝试它。只有在Autosize = false方法中设置时，才会在设计器中设置OnLayout()。