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    Datagridview cellvalidating cancel

    If the event handler for the Cell Validating event finds that the value is an empty string, the Data Grid View prevents the user from exiting the cell until a non-empty string is entered.

    For a complete explanation of this code example, see Walkthrough: Validating Data in the Windows Forms Data Grid View Control.

    //设定Data Grid View的样式 private void set Dg Style() 3. Column Headers Height Size Mode = Data Grid View Column Headers Height Size Mode. Row Headers Width Size Mode = Data Grid View Row Headers Width Size Mode. Header Text = "标题"; ----------- // 设定包括Header和所有单元格的列宽自动调整 Data Grid View1. Sort Glyph Direction属性以显示排序标志符号。 作为对的Sort(IComparer)方法重载替代方法,可以通过实施提供了Sort Compare事件处理程序自定义排序。此事件发生在用户单击列或配置自动分拣头当调用Sort方法的Sort(Data Grid View Column,List Sort Direction)重载。事件发生时,每行一对在控制,使您能够计算它们的正确顺序。 注:Sort Compare事件不会发生当Data Source属性设置或当Virtual Mode属性值为true。 5.6.3常见问题及案例 1)如何避免用户对列排序? 2)如何针对多个列排序? 5.7边框样式 使用Data Grid View控件,您可以自定义该控件的边框和网格线,以改善用户体验的外观。您可以修改除了为细胞内控制边境网格线的颜色和样式的控件的边框样式。网格线颜色控制,通过Grid Color财产。您还可以申请普通细胞,行标题单元格和列标题单元格不同的单元格边框样式。对于先进的边框样式的Data Grid View提供先进的边框样式的属性。 注:网格线颜色仅用于与Data Grid View Cell Border Style枚举和枚举的Data Grid View Header Border Style单值单,Single Horizo?? By default, text in a Data Grid View Text Box Cell does not wrap. This is similar to setting a Text Box’s Text property to the same text when the Text Box’s Multi Line property is false. 如何在单元格内同时显示图标和文本? Data Grid View控件没有对在同一单元格内同时显示图标和文本提供支持。但通过实现自定义的绘制事件,如Cell Paint 事件,你可以轻松实现这个效果。 下面这段代码扩展了Data Grid View Text Box Column 和Data Grid View Text Box Cell类,将一个图片显示在文本旁边。这个示例使用了Data Grid View Cell Style.

    Data Table(); dt Update = this.dbconn(str Sql); dt Update. Auto Size Columns Mode 属性。 3) 设定列头的高度和行头的宽度自动调整 // 设定列头的宽度可以自由调整 Data Grid View1. Compare(Object)方法,对此,作为输入传递时的Data Grid View的Sort(IComparer)方法重载被称为Data Grid View Row对象。有了这个,你可以计算出正确的行排序的基础上在任一列的值。 的Sort(IComparer)方法重载不设置Sorted Column和Sort Order的属性,所以你必须总是设置Data Grid View Column Header Cell. Why does the cell text show up with “square” characters where they should be new lines(TODO,未能实现该效果)? Because text doesn’t wrap, new line characters in the text do not apply and so they are displayed as a “non-printable” character.

    You will typically call the programmatic resizing methods at specific times.

    It is also useful to provide initial sizes for user-resizable rows, columns, and headers, and for column fill mode.

    Auto Resize Column(0, Data Grid View Auto Size Column Mode. Auto Resize Columns() b,临时的,让行高自动调整 // 让 Data Grid View1 的所有行高自动调整一下。 Data Grid View1.

    All Cells); // 让 Data Grid View1 的第一列的列宽自动调整一下。 Data Grid View1.

    Auto Resize Row(0, Data Grid View Auto Size Row Mode. Auto Resize Rows() c,临时的,让行头和列头自动调整 // 列头高度自动调整 Data Grid View1. Context Menu Strip3; // 单元格的 Context Menu Strip 设定Data Grid View1[0, 0]. Context Menu Strip4;对于单元格上的右键菜单的设定,优先顺序是: Cell Data Grid View⇒ Cell Context Menu Strip Needed、Row Context Menu Strip Needed 事件利用 Cell Context Menu Strip Needed 事件可以设定单元格的右键菜单,尤其但需要右键菜单根据单元格值的变化而变化的时候。比起使用循环遍历,使用该事件来设定右键菜单的效率更高。但是,在Data Grid View使用了Data Source绑定而且是Virtual Mode的时候,该事件将不被引发。[C#]// Cell Context Menu Strip Needed事件处理方法private void Data Grid View1_Cell Context Menu Strip Needed(object sender, Data Grid View Cell Context Menu Strip Needed Event Args e)同样,可以通过 Row Context Menu Strip Needed 事件来设定行的右键菜单。[C#]// Row Context Menu Strip Needed事件处理方法private void Data Grid View1_Row Context Menu Strip Needed(object sender, Data Grid View Row Context Menu Strip Needed Event Args e) Cell Context Menu Strip Needed 事件处理方法的参数中、「e. Row Index=-1」表示列头。Row Context Menu Strip Needed则不存在「e. Row Index=-1」的情况。________________________________________⑮ Data Grid View 的单元格的边框、网格线样式的设定1) Data Grid View 的边框线样式的设定Data Grid View 的边框线的样式是通过 Data Grid View. Right = _ Data Grid View Advanced Cell Border Style. Cell Parsing 事件可以设定用户输入的值。下面的示例:当输入英文文本内容的时候,立即被改变为大写。[C#]//Cell Parsing 事件处理方法private void Data Grid View1_Cell Parsing(object sender, Data Grid View Cell Parsing Event Args e) ________________________________________⑱ Data Grid View 新加行的默认值的设定 需要指定新加行的默认值的时候,可以在Data Grid View. You must then call the Auto Resize Columns method to adjust the column widths to the calculated ideal. For example, if you call the Auto Resize Rows(Data Grid View Auto Size Rows Mode, Boolean) overload of the Auto Resize Rows method and pass in a value of false for the Boolean parameter, the overload will calculate the ideal heights and widths for cells in the row, but it will adjust the row heights only. Auto Size Columns Mode = Data Grid View Auto Size Columns Mode. ntal Scroll Bar和Vertical Scroll Bar属性显示。 Scroll Bar控件直接访问这些让你拥有滚动更好的控制。 5.5.3滚动属性 有许多的属性,提供更大的详细程度如何设?? Enable Resizing; Data Grid View 列宽和行高自动调整的设定: // 设定包括Header和所有单元格的列宽自动调整 Data Grid View1. Selected。 5.5滚动(滚动) Data Grid View中毫无疑问地会提供对水平和垂直滚动条的支持,它同时也支持使用鼠标滚轮进行垂直滚动。水平方向的滚动基于像素值,而垂直方向的滚动则基于行的索引,不支持垂直的Data Grid View方向的基于像素值的滚动。 5.5.1 Scroll事件 当你滚动Data Grid View的引发Scroll事件,让您被通知滚动发生。对滚动事件参数定位属性可以让你知道滚动的方向。 5.5.2滚动条 Data Grid View的滚动条可以访问,它通过保护Horizo??

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