大家GridView都用的比较多吧..有没遇到单元格需要合并的需求..
单元格合并原理其实很简单，就是逐行判断要合并的单元格里的值是否和上一行的相同，要是相同的 话就合并，不同的话就接着判断
我们可以通过扩展方法为GridView添加单元合并
public static class GridViewExtensions
{
/// <summary>
/// GridView行合并
/// </summary>
/// <param name="gridView"></param>
/// <param name="field">合并参数(匿名类型)
/// ColumnIndex:要合并行的索引 (以0开始,必须指定)
/// ID(可选):如果该行为模板行则必须指定
/// PropertyName:根据ID属性 默认值为Text
/// Colums:(string类型)表示额外的行合并方式和ColumnIndex一样(多个使用逗 号隔开,如Colums="5,6,7,8")
/// 例:
/// 合并第一行(第一行为模板行),绑定的一个Label名称为lblName 根据Text 属性值合并 第6行方式和第一行相同
/// new {ColumnIndex=0,ID="lblName",PropertyName="Text",Columns="5"}
/// </param>
public static GridView RowSpan(this GridView gridView, object field)
{
Dictionary<string, string> rowDictionary = ObjectLoadDictionary(field);
int columnIndex = int.Parse(rowDictionary["ColumnIndex"]);
string columnName = rowDictionary["ColumnName"];
string propertyName = rowDictionary["PropertyName"];
string columns = rowDictionary["Columns"];
for (var i = 0; i < gridView.Rows.Count; i++)
{
int rowSpanCount = 1;
for (int j = i + 1; j < gridView.Rows.Count; j++)
{
//绑定行合并处理
if (string.IsNullOrEmpty(columnName))
{
//比较2行的值是否相同
if (gridView.Rows[i].Cells [columnIndex].Text == gridView.Rows[j].Cells[columnIndex].Text)
{
//合并行的数量+1
rowSpanCount++;
//隐藏相同的行
gridView.Rows[j].Cells [columnIndex].Visible = false;
if (!string.IsNullOrEmpty (columns))
{
columns.Split (',').ToList<string>().ForEach(c => gridView.Rows[j].Cells[int.Parse (c)].Visible=false);
}
}
else
{
break;
}
}
else
{
//模板行的合并处理
if (GetPropertyValue(gridView.Rows [i].Cells[columnIndex].FindControl(columnName), propertyName) == GetPropertyValue (gridView.Rows[j].Cells[columnIndex].FindControl(columnName), propertyName))
{
rowSpanCount++;
//隐藏相同的行
gridView.Rows[j].Cells [columnIndex].Visible = false;
if (!string.IsNullOrEmpty (columns))
{
columns.Split (',').ToList<string>().ForEach(c => gridView.Rows[j].Cells[int.Parse(c)].Visible = false);
}
}
else
{
break;
}
}
}
if (rowSpanCount > 1)
{
//行合并
gridView.Rows[i].Cells[columnIndex].RowSpan = rowSpanCount;
//判断是否有额外的行需要合并
if (!string.IsNullOrEmpty(columns))
{
//额外的行合并
columns.Split(',').ToList<string> ().ForEach(c => gridView.Rows[i].Cells[int.Parse(c)].RowSpan = rowSpanCount);
}
i = i + rowSpanCount - 1;
}
}
return gridView;
}
private static Dictionary<string, string> ObjectLoadDictionary (object fields)
{
Dictionary<string, string> resultDictionary = new Dictionary<string, string>();
PropertyInfo[] property = fields.GetType().GetProperties (BindingFlags.Instance | BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.GetProperty);
foreach (PropertyInfo tempProperty in property)
{
resultDictionary.Add(tempProperty.Name, tempProperty.GetValue(fields, null).ToString());
}
//指定默认值
if (!resultDictionary.Keys.Contains("ColumnIndex"))
{
throw new Exception("未指定要合并行的索引 ColumnIndex 属性!");
}
if (!resultDictionary.Keys.Contains("ColumnName"))
{
resultDictionary.Add("ColumnName", null);
}
if (!resultDictionary.Keys.Contains("PropertyName"))
{
resultDictionary.Add("PropertyName", "Text");
}
if (!resultDictionary.Keys.Contains("Columns"))
{
resultDictionary.Add("Columns", null);
}
return resultDictionary;
}
/// <summary>
/// 获取一个对象的一个属性..
/// </summary>
/// <param name="obj"></param>
/// <param name="PropertyName">属性名称</param>
/// <returns>属性的值, 如果无法获取则返回 null</returns>
private static object GetPropertyValue(object obj, string PropertyName)
{
PropertyInfo property = obj.GetType().GetProperty (PropertyName);
return property.GetValue(obj,null);
}
}