C# GetType().GetField at an array position

Question

public string[] tName = new string[]{"Whatever","Doesntmatter"};
string vBob = "Something";
string[] tVars = new string[]{"tName[0]","vBob","tName[1]"};

Now, I want to change the value of tName[0], but it doesnt work with:

for(int i = 0; i < tVars.Lenght;++i)
{
    this.GetType().GetField("tVars[0]").SetValue(this, ValuesThatComeFromSomewhereElse[i]));
}

How can I do this?

EDIT: Changed code to show more exactly what I am trying to do.

Answer 1

The field's name isn't 'tName[0]', it is 'tName'. You would need to set the value to another array, whose 0 index is the value you want.

this.GetType().GetField("tName").SetValue(this, <Your New Array>));

Answer 2

Why not just do this

tName[0] = "TheNewValue";

Answer 3

You can get the existing array, modify it and set it back to the field like so..

string [] vals = (string [])this.GetType().GetField("tName").GetValue(this); 
vals[0] = "New Value";

Answer 4

Don't know if it's a good idea to do what you try to do, but this should work:

((string[])GetType().GetField("tName").GetValue(this))[0] = "TheNewValue";

I think it would be good idea to split it in multiple statements! ;-)

Answer 5

SetUsingReflection("tName", 0, "TheNewValue");

// ...

// if the type isn't known until run-time...
private void SetUsingReflection(string fieldName, int index, object newValue)
{
    FieldInfo fieldInfo = this.GetType().GetField(fieldName);
    object fieldValue = fieldInfo.GetValue(this);
    ((Array)fieldValue).SetValue(newValue, index);
}

// if the type is already known at compile-time...
private void SetUsingReflection<T>(string fieldName, int index, T newValue)
{
    FieldInfo fieldInfo = this.GetType().GetField(fieldName);
    object fieldValue = fieldInfo.GetValue(this);
    ((T[])fieldValue)[index] = newValue;
}

Answer 6

I gave up and splitted the table in 3 different variables.