问题描述

我正在寻找一种格式化 DataGridViewTextBoxColumn 的方法，以便在数据绑定期间格式化要数据绑定的值.例如，我有一个 CompanyName 属性，当数据绑定发生时，我需要从 CompanyName 中获取前 5 个字母.

I'm looking for a way to format DataGridViewTextBoxColumn so that the value to be databinded is formatted during databinding. For example I have a CompanyName property and I need to take first 5 letters from the CompanyName when databinding happens.

我可以挂钩不同的 DataGridView 事件(例如 RowsAdded)并循环遍历所有行并完成此操作，但我想找到更复杂的方法来做到这一点.由于我决定使用数据绑定，因此循环访问数据并对其进行修改有点违反数据绑定的概念.

I could hook on different DataGridView events (e.g. RowsAdded) and loop through all the rows and do the trick, but I'd like to find more sophisticated way to do this. Since I have decided to use databinding, looping through data and modifying it is a bit against the databinding concept.

我所追求的是如何做与下面相同的事情，但添加自定义格式化逻辑:

What I'm after, is how to do the same as below, but add custom formatting logic:

dataGridView1.Columns[colSomeDate.Index].DataPropertyName = "SomeDate";
colSomeDate.DefaultCellStyle.Format = "yyyy";

我认为我应该实现 IFormatProvider，但我不太明白我应该如何实现它.

I think I should implement IFormatProvider, but I don't quite understand how I should implement it.

dataGridView1.Columns[companyName.Index].DataPropertyName = "CompanyName";
companyName.DefaultCellStyle.FormatProvider = new ShortText(); // ShortText should implement IFormatProvider

推荐答案

我不知道IFormatProvider，但是DataGridViews CellFormatting-event能帮到你吗?

I don't know about the IFormatProvider, but can the DataGridViews CellFormatting-event help you?

private void dataGridView1_CellFormatting(object sender,
    DataGridViewCellFormattingEventArgs e)
{
    if (e.ColumnIndex == 0)
    {
        e.Value = e.Value.ToString().Substring(0, 5); // apply formating here
        e.FormattingApplied = true;
    }
}

http://msdn.microsoft.com/en-我们/图书馆/z1cc356h.aspx?ppud=4

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