ant-design-blazor/site/AntDesign.Docs/Demos/Components/Table/demo/ColspanRowspan.razor

@using System.ComponentModel

<Table DataSource="@data" Bordered>
    <Column @bind-Field="@context.name" ColSpan="@GetColSpan(context.key,"name")"></Column>
    <Column @bind-Field="@context.age" ColSpan="@GetColSpan(context.key)"></Column>
    <Column @bind-Field="@context.tel" Title="Home phone" HeaderColSpan="2" RowSpan="@GetRowSpan(context.key)" ColSpan="@GetColSpan(context.key)"></Column>
    <Column @bind-Field="@context.phone" HeaderColSpan="0" ColSpan="@GetColSpan(context.key)"></Column>
    <Column @bind-Field="@context.address" ColSpan="@GetColSpan(context.key)"></Column>
</Table>

@code{ 
    Data[] data =
            {
        new Data(){ key="1",name="John Brown",age=32,tel="0571-22098909",phone="18889898989",address="New York No. 1 Lake Park"},
        new Data(){key="2",name="Jim Green",tel="0571-22098333",phone = "18889898888",age = 42,address="London No. 1 Lake Park"},
        new Data(){key="3",name="Joe Black",age = 32,tel="0575-22098909",phone = "18900010002",address="Sidney No. 1 Lake Park"},
        new Data(){key="4",name="Jim Red",age = 18,tel="0575-22098909",phone = "18900010002",address="London No. 2 Lake Park"},
        new Data(){key="5",name="Jake White",age = 18,tel="0575-22098909",phone = "18900010002",address="Dublin No. 2 Lake Park"}
    };

    public class Data
    {
        public string key { get; set; }

        public string name { get; set; }

        public int age { get; set; }

        public string tel { get; set; }

        public string phone { get; set; }

        public string address { get; set; }
    }

    private int GetRowSpan(string key)
    {
        if (key == "3")
            return 2;
        else if (key == "4")
            return 0;
        else
            return 1;
    }

    private int GetColSpan(string key, string columnTitle = "")
    {
        if (key == "5")
            if (columnTitle == "name")
                return 5;
            else
                return 0;
        else
            return 1;
    } 
}