在C＃中动态填充对象

Question

I have an excel sheet with cells . I want to read and populate an object at runtime. This is what I tried.

dynamic Common = new JObject();

foreach (DataRow dsRow in dtTable.Rows)
{
    // On all tables' columns
    foreach(DataColumn dc in dtTable.Columns)
    {

    var columnName = dc.ColumnName;
        Common.columnName = dsRow[dc].ToString();
    }
}

But the problem here is dtoCommonTag.columnName is constant for all the columns from dsRow[dc].ToString() .

How do I dynamically change the key values of Common ?

Answer 1

Two options here:

Have you tried

Common[columnName] = dsRow[dc].ToString();

Worst case scenario, you can write a switch statement to affect every column. It won't be pretty but it will work.

Answer 2

That is not how dynamic objects work. You can dynamically add properties to a dynamic object, but not "by string".

You can, however, use an ExpandoObject to do that:

var x = new ExpandoObject() as IDictionary<string, Object>;
x.Add(columnName, dsRow[dc].ToString());

dynamic dyn = x;

Then you can use the column names as properties.

Answer 3

Use "Reflection". Then you can pass the property name as a string value and then pass a value to that property. Try this

FieldInfo info = typeof(Common).GetField(dc.ColumnName);
info.SetValue(null, dsRow[dc].ToString())