String Replace in c#

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hi

i have use the follwing code
str=str.Replace("a",dictionary[key])
but is in note replacing

actually Dictionary[key] contains a list of value.

it is replace by this

System.Collections.Generic.List`1[System.Object]
not with the exact value.

Posted 21-Jan-14 1:41am

rahuls1

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Maarten Kools 21-Jan-14 7:45am

Your dictionary returns a List<Object>, and by passing this to the Replace method, the list's ToString method is called. Maybe if you post some more code we can properly help you out.

rahuls1 21-Jan-14 7:47am

foreach (string key in dictionary.Keys)
{
if (key == "Precondition")
{
List<object> values = dictionary[key];
strContent = strContent.Replace("init_step_here", dictionary[key].ToString());
//strContent = strContent.Replace("stimulation_step_here", dictionary[key].ToString());
//strContent = strContent.Replace("reset_step_here", dictionary[key].ToString());
//strContent = strContent.Replace("eval_step_here", dictionary[key].ToString());

}

}

rahuls1 21-Jan-14 7:47am

abve is the code..

BillWoodruff 21-Jan-14 9:58am

A generic Dictionary requires that Keys be unique: so, for me, your code doesn't make sense: there can be only one Key with the value "Precondition" !

"List<object> values = dictionary[key];" also makes no sense to me.

What is your goal in this application ? If you describe your goal clearly, I am sure folks here will assist you.

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Vedat Ozan Oner · Answer 1 · 2014-01-21T02:13:00

better to write a helper function to convert List<object>'s to a meaningful string or select an object from the list, then convert it to a string. it depends on your aim.

One helper might be:

C#

string MyListStringRepresentation(List<object> l) {
 string s = string.Empty;
 l.ForEach(l1=>s+=l1.ToMyString());
 return s;
}

string ObjectStringRepresentationAt(List<object> l, int idx) {
 return l[idx].ToMyString();
}</object></object>

then you can use above functions when replacing a text in your code. there are really many options here. it depends on what you want to do.

besides that, I advice you not to use List<object> which is very ambiguous. use type-safe declarations like List<string>, List<SomeClass>, List<SomeInterface>, List<SomeAbstaction>. you have .net framework, use its power. even my helper functions is not good enough in terms of my suggestion. I can use extension methods, overrides etc.

OriginalGriff · Answer 2 · 2014-01-21T01:53:00

Using ToString on a collection of any sort does not return the content - it returns the name of the collection type as a string instead, because none of the standard collection objects implement a ToString overside - so you get the stardard Object implementation, which gives the highest possible type name in the inheritance try for that object. Hence the replacement with "System.Collections.Generic.List`1[System.Object]".

If you want to replace a single string with a collection of strings, then you could do this:

C#

str=str.Replace("a",string.Join("?", dictionary[key]));

Where "?" is the value you want between each of the strings in the values collection.

String Replace in c#

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